I made some small holes, just big enough to fit the cord. Using paracord the size of a big shoestring makes it easy to quickly assemble everything. Holes are punched out with one click, instead of carefully cutting it to size each and every time.
This is why the floor plate needed to be foldable. I can enclose the back part this way. I did this for more protection and to control the weight, but I already dropped the idea.
Little flap so the horizontal tube can slide down (and up). Upward position is for riding with the cart behind my bicycle, downward position is for camping and being able to enter the thing.