That target seems to have some curious hits and bends.
Personally, for a number of reasons I am not a fan of the so called “Knockdown” resettable targets. For one thing, the kill zones I’ve seen are in the wrong place. For metal targets, I will refer you to the likes of Hickok45 videos and his knockover chickens, turkeys, boars.
Make templates of whatever size, whether it be chickens, turkeys or dinosaurs, but make sure the edges are not overly complicated. Ensure the bottom of the sheet can be fixed into a block of wood, either by inserting into a drilled out hole or saw cut. Take the templates to a SMALL local metal work shop, tell them what thickness of steel you want. When you ask whether they’ll do it, and ask a price, to get a person to do the job for a cheap price the KEY things to say are… THAT FOR SUCH A SMALL CASH JOB YOU ARE PREPARED TO WAIT A FEW WEEKS UNTIL SUCH TIME AS THEY HAVE A FEW SPARE MINUTES AND HAVE SUCH SCRAP METAL. Such a comment will likely be met with interest, especially by anyone who would like a little pocket/beer money. Don’t ask for a receipt.
Once you get them, make whatever size wooden bases (and increase in size as necessary for power levels) and them paint as necessary.
I once had lots of them, and they were such good targets they even walked off one night.