I have very limited space at my small home and garage for a gym. I am hoping to find room for a power rack and platform. What do you think is the minimum square footage I need for a rack, platform, and some sort of weight rack? Rip's recommendation for the platform seems to be 8'x8' - but I wonder how much space I need around that to be able to load the weights, etc. Considering a shed in the backyard, e.g.