I made one for the 230sl and one for the 57 TBird from specs I scrounged from the interweb. No real magic there, but with about $25 in scrap 1" tube, $20 in ebay casters, $5 in pipe insulation, $4 in paint, and some electricity, mig wire and the like, I now have two pretty good carts. Plus I need all the welding practice I can get . . . So maybe time to make one for the 280sl, one for the 56 vette, etc., etc. . . . Anyway, they are not hard to do and can be a fun project.