I have a bit more progress to report.
I got the axles cut to length, drilled for cotter pins, and welded to the undercarriage trucks. Then I powdercoated the trucks in argent silver like I do rally wheels in. I also extended the handle 9 inches and powdercoated it the same color. The handle is made out of solid 5/8 inch round rod that I had left over from a wrought iron job awhile back.
Tomorrow I hope to get the bottom cut out of the tub and get a new one fab'd up and maybe even welded in place.