I was talking with one of my co-worker. that use to build micro sprint car frames. I kind off like what he did. take two half inch 4 x 8 sheets of plywood glue the two together. might be over kill. one may do the job?? build stand with rollers. make some leaving legs with nut bolt and some angle. cover the top with sheet steel. my scaffolding guy said he could build one out of scaffolding as well. But I'm thanking there would be to much give in it. just food for thought. that and I would like to see what others have done.