If you could design your own PCP...

I think I'd end up with something like a cross between an fx crown and a daystate huntsman. Shorter airtube than the huntsman, and wider, but not as fat as a normal bottle. Something like what's used on my 1322 pcp

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So you'd end up with a gun that's sleeker and has a lower profile than a bottle gun. But also has a lot of the weight still tucked back towards the center of balance, not so far out toward the end of the gun.

Use the trigger guard in a fold down fashion to cycle the action. Like a lever action, but without a full lever. (think ruger no. 1) Using a low profile rotary mag to keep low scope to bore axis.

As for the barrel, likely a thin liner turned into a bull barrel with layers of carbon fiber. Threaded into the receiver, and also tensioned against the receiver.

Monoblock receiver with preferably no regulator.

External hammer tension, hammer striker, and port size adjustments would be sweet as well.

Oh a balanced or at least semi-balanced valve would be a must. Nothing says class quite like a soft hammer cycle that packs a huge wallop at the muzzle.
 
A gun with lots of the design features of a USFT (low fill pressure, no regulator, single shot swing breech, easy access to barrel from the rear for cleaning, solid yet easily swappable breech to barrel connection, excellent trigger) but in a nice laminate stock that'd lend itself more to general use instead of being such a specialized shoot it from a bumbag ergonomic effect. Call it a sporter USFT maybe. I think the sticky spot is that I'd want it to be around 45-50 fpe in .22 and I'm positive that that 1500psi top end of a sub 20 fpe USFT would make it impossible. Heck, even a 3000 down to 1800 fill pressure, and again no regulator but somehow keep the consistency of an unregged 20fpe USFT, would be SWEET. 
 
I’d like to see a 6 shot revolver in .177 or .22.

Röhm Twinmaster ticks some of your boxes, I really don't know why it fell of the radar, it is beautiful made and can be modded in a number of ways, e.g move the back sight up on the frame and change the grip to make it look like a S&W double action revolver

did I fire 5 or 6? - who cares, got 8

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- 8” progressive twist rifled barrel

No, but you can put in another one because..

- barrel threaded into frame

Yes

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-Single action, match grade trigger

Single and double action

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- regulated

yes

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- Power from 6 fpe to 20 fpe

Big fail, but trimming the reg. and hammer spring and adding a longer barrel could help a lot

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- Precise open sights

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- Pic rail

No, but 2 screw holes on top of frame

- Ability to adjust HST and reg

Fail, not from the outside

- Option of Walnut or rubber grip

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Twinmaster - PCP and Co2

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A Wolverine Walnut HP 38 inch long. weight of 7.5 and with 580 cc air reservoir, ART Barrell.

The magazines of the Vulcan 2 or Uragan.

The safty the one of the Bantam Sniper.

The side lever should be the one of the Uragan.

Accuracy of the Uragan - Wolverine HP with the ART barrell would be a must. 

It would be able to interchange calibers among .25 and .30 Cal With just a switch of preset preassure. Giving 850 fps on each caliber with 33.95 grain in .25 Cal and 850 fps with 44.75 grain in .30 Cal.

Best would be to be able to include from the begining the kit of two calibers of your choice.

It should come with two magazines of each caliber, as the Uragan. 

That would be, for me, the perfect air rifle.

But one previous an easier achievement would be the following in four simple steps:

1) To take a Vulcan 2;

2) change the steel tube and remove it;

3) Mount a more larger cilinder than the one of the Uragan;

4) Design a beautifull stock similar to the one of the Wolverine to fit into the action with all the adjustments possible in the back..

That simple it would be to build the perfect rifle: Accurate, not long, not heavy, reliable, lot of shots per fill, solid: Perfect.

The change in calibers would be for further investigation.


 
I have 2 actually for 2 different uses. One rifle one bullpup.

For me mine would be based off the EVOL. The mono block design with the 50MOA built in is nice. Threaded in barrel that's tensioned is so sturdy. Would love cocking ease of Uragan .22 I owned. Also power adjustability ease of Taipan Veteran however with the clicks in the HS adjuster found on the Edgun Leshiy. With both a .22 and .30 barrel.

Then #2 would be based off a Taipan shorty. Would only have a 10" barrel for extremely compact gun and shorter airtube to match Would take forward cocking from Edgun R5M. Mag system from Uragan with Uragan style stock and cheek piece. Same easy adjustable power from Taipan with clicks from Edgun. .22 caliber for me.
 
There would be no need for me to design one if Taipan put their action in a Brocock stock. The gun would only be slightly bigger but more stable and it would be nice to get the scope out of the clouds and closer to the bore. If I had to design one it would be a FX Crown with a VLA and a minimum of a 15mm barrel threaded into the receiver. Forget catering to switch caliber users, they make a gun weaker out of convenience. I would rather just buy two robust guns if I want 2 calibers. How many of us have multiple deer, varmint and target rifles plus multiple shotguns. 
 
THat Rohm was a gun I almost hated?! Especially the double action weight and feel. Mine wasn't very precise either. Anyway I just had to vent a bit, lol.....

I want a pcp built just for reliable plinking up to medium distances, maybe if I keep mentioning this someone will see the value of it.

Anybody know what the Browning takedown 22rfr is?? Here is it below.

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I want a semiauto slug shooter that looks similar and keeps with this slender and lightweight form factor.

Attributes - 

#1 Made mostly of steel and brass and offered in basic to exhibition grade packages. Excellent Build Quality of course!

#2 Air reservoir hidden in the buttstock.

#3 Slugs in a tube fed system under the forstock like many of the old 22rf's stacked end to end with a simple and rugged elevator system like those old 22rf's used to have.

#4 Yep a shouldered barrel and threaded into the receiver. 

11 fpe is fine, shot count doesn't need to be huge, just a fun, reliable, and precise plinker made like a rifle should be made.



SURELY already does the trick for me for a match rifle! So does my USFT as far as 20 fpe rifle.



Another idea I have is having a duplicate of the feel of the action of my Anschutz 1827F biathlon rifle which is how a TRUE biathlon action should be! As well as a stick magazine feed system in it for slugs.
 
If I had the resources I would have a pcp built that was based on the classic lever action 30/30. 
It would use the lower tube as a reservoir, and the user would load 10 slugs into it in the same manner the powder burner is loaded through the side. The slug tube could be a small tube that nestled between the air tube and barrel. 
It would be all blued steel with brass hardware, would have a fine quality wooden stock and would have open sights as well as a picatinny rail. Blued steel barrel threaded for a moderator. 
It would be designed to give 10shots at the optimal velocity for whatever slug was determined to be best suited for the platform. Say 850-900 fps with a mid 20’s weight .25cal slug. Barrel twist would be optimized for that particular weight slug at that particular speed.

The rifle could be cocked and uncocked with the hammer as well. All functions would work as the original 30/30. 
That would be my personally designed pcp rifle and i would live happily ever after with it in the squirrel woods.