My Dad is the one who made the metal framework for the orginal carry-all on my 100. The carry-all is mounted to my 100's 3 point hitch. It raises and lowers that same as any sleeve hitch mounted attachments.
I have 2 different plaforms/boards that I can use.
One is the working deck

and the other one is for shows only.

The working platforms/boards is made of plywood and chipboard.
The show platforms/boards is from 2 inch wide oak flooring. Two metal strips and 4 bolts (2 on each side) holds the oak flooring together. A groove piece of wood allows the platforms/boards to slid off and on.
Dad sold 2 carry-alls at Red Power. Both need to be built. Contact me if anyone is interrested in a carry-all.