Gfugal, you don't need a shop, yard or tree to hang it from. If you live in an apartment you can just find a stud on an open wall and screw a length of 2x4 onto the wall. You can have your pully, ruler, etc all attached to that one 2x4 and when you take it down you'll just have a couple tiny screw holes to fill. If the wife/gf doesn't like it as a permanent fixture, just put it up and take it down with each use. I spent a year building in an apartment and you definitely have to improvise!