Got the roll bar installed. Its six point and sandwiches the sheetmetal of the floor, but is bolted through and attaches to outriggers welded directly on the frame. Flex may be a problem. Comments? I can cut the floor, so the body is free of the cage, and rides only on the doughnuts.
Much thanks to Techinspector for his patience, advise, and informative article. It made all the difference to have a pro do the welding. Rad