i put 3 layers of burlap on the face side, but im kinda worried about the back blowing out,you can pull the arrows out with 2 fingers, and as far as getting messy , i think its gonna be better than having styrofoam all over the place wich is why i was trying to find something different, original idea was cardboard particle board cut in 1' widths and stacked between 2x6s with threaded rods to smash together,
oh well it should last long enough till i find some particle board stuff. il cover with plastic to keep it dry.