I only have 5 pcps and 4 of them are stored in coffee tables in my great room to keep them handy. I'll include a couple pictures. The top of the coffee tables is on full extension ball bearing drawer slides so you just push it out of the way to get a gun out. Not reasonably possible for 60 but might be something to think about if you want to keep a few handy.
I also have a drawer under my bed (sorry no pictures) that holds my powder burners and the other PCP. I did this to save space and keep the guns not readily visible. The drawer and the coffee table lock to keep my grandkids from finding them and trying to use them unsupervised.
For 60 what I think I would do if you have the space is to have two heights of vertical racks along a wall or two. On the bottom you need cutouts for the butt of the gun. Up higher you need a board along the wall that you fasten spacers to with drywall screws from below. The width of the spacers can be custom since some guns need a little more space than others. I had a built in cabinet in my closet set up this way for a dozen or so guns in my last house. If you are not a good trim carpenter you might have to find one to make this. But if you tell them what you need they may also have ideas.
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