That thing is a TANK. Seriously looks sweet, but heavy. I think Paul said it but you might need air brakes for a load like that behind you. I have to say I always try and bring the kitchen sink as well but end up only using a 1/4 of what I have before either finding something that works or giving up. Canal bikes are a good excuse to overpack IMO. The also are the warm weather version of the ice fishing sled. Essentially the best home made jerry rigged thing you own.
Sweet Bike but don't let the cops see you. Using milkcrates for anything but their intended purpose is a federal offense with capital punishment if found guilty. Since you cut them up that may be punishable by death. It says so right on the sides.