Good luck! hope they turn out well for ya!! If I was closer I could help ya out, I have a mig welder metal cutting band saw and a big drill press, I can make about anything I want in steel!!
I'm going the wood route. Here's my inspiration. https://www.indianagunowners.com/fo...ade_target_stand_for_long_distance_steel.html
It has to be able to come apart easily, as it won't be staying at the range.