I make mine out of 3/4" PVC pipe
cut 6 2' sections, 4 1' sections, 4 4" sections
6 90* elbows
4 end caps
The main body is the 6 2' sections 2 elbows and 2 t-fittings all glued together. to form an H that is closed on top.
Take the 4 1' sections 4 4" sections 4 elbows 2 t-fittings and 4 end caps.
Glue the 1' sections to the t fitting on the two joints oppsite of eachother. Now Glue the elbows facing oppsite of the unused joint. Glue the 4 4" sections in to the elbows then glue the end caps on to the 4 4" sections.
I glue mine together so they do not fall apart. You can add sand to the feet and seal off with calking or epoxy or something like that. I do not glue the feet on so that can be taken off for transport. I use the foam craft board to mount targets too and just drilled holes in the PVC pipe and used 1.5" 1/4x20 bolts and washers.