Roger, its a Giant U. The far wall is a dead end, industry, and where I was shooting from in the 2nd shot, will be another dead end, no full loop (yet). There's going to be staging, where I was standing in the first shot.
zachary, its 1x2 & 1x4 board. The leg section is a square frame with a single lengthwise brace at the top, to keep the legs from moving around. Its not quite "perfect" has I'm using a hand saw, but its good enough, since the modules will be tied to each other, I can shim the layout to be level afterwards.