Jamie - thank you for your support! Right now I need to find the time to refine the design so that the articulating bar doesn't get hung up on those giant front wheels. I may or may not have time to tinker this weekend. If I do I will keep you posted.
Meanwhile I see you are full steam ahead on paint and a very cool wood load. Instead of glue or screws I would recommend a small magnet. The refrigerator quality stuff comes with an adhesive backing and is can be cut with a regular pair of scissors. You can pick it up by the roll at a decent hardware store. That would of course allow easy swapping of loads and prevent things from falling off without permanent fasteners.
