A safety note about construction...
If you're going to weld/braze zinc-coated EMT conduit for the frame, best to do it outside with a breeze (or fan)
The fumes of the heated zinc can cause "metal fever".
The thing has turned out to be remarkably useful. I never used to be worried about my beater bike getting stolen, but now that it has half the trailer hinge permanently attached to the rear axle, I sometimes worry about losing it.