This is the way to go, the frame for it found in any neighborhood. http://www.frugal-living-freedom.com/build-a-greenhouse.html A Greenhouse with plastic. B Shop building with tin. C Chicken wire/chain link fence, house wrap and 2" of mortar/stucco/quickrete could make a decent solid shelter. May have to beef up the supports, at least till the crete cured. My shop is round topped with 2" conduit for rafters and wall studs, 3' spacing, jumping on top of it does not move it at all.