my back yard is kinda small but we had a moveable speedball field awhile back. made out of plywood/scrap boards and stuff, ladders, a trash can, large buckets (the kind that 4000 paintballs come in) and we had an enormous cardboard box that had been cut and unfolded so it would sit up in the shape of a pentagon. but after a few days it fell apart lol. my yard is like 50'x50', if even that, and its shaped like a trapezoid so you dont even get the whole area. it was a small field but fun, and of course everyone had their velocity down to 220-240.
but that all ended when we were in the "safe" area and my friend whose gun was on three round burst and he thought was on safety shot me twice in the face and missed both of my eyes by centimeters... that was a very scary experience. but now we only play at established fields with refs to yell at you to put your barrel sock on
