I have an old building that was taken down a few years ago when the roof collapsed in the snow of 2010 and I've been trying to come up with solutions to getting it useable again. The walls are still there (approx 7ft high) and the floor. The cheapest and easiest idea is to fit a poly tunnel over the top attached onto the old uprights or bolted onto the wall head. I was just wondering if anyone has done this or whether you can foresee any problems or should I just bite the bullet and invest into making it back into a solid building?