I built my own, also. It is all self contained, fuel, battery, and cooling system. Built it out of stuff laying around shop. Its hi enough that my cherry picker slides underneath, and stout enough to hold anything. Does take up a little more room, but if i leave an engine on it, I can go out to shop in the middle of winter and fire up an open headered motor for the fun of it! Most of the time it just collects spare parts until I need it again.