Found a fundamental design flaw in my design. The cross members on the R8 have a hump in the middle that hangs down lower than the outside so it "rocks" on the centre bit unnervingly. I'm halfway through making some 5mm plates to weld two on each corner to pack it up so it sits level.
I also made 4 plates that have a long bolt through it with a spacer that I can use as a retaining bracket to ensure the shell doesn't bounce off the trolley when wheeling it around.
I also made 4 plates that have a long bolt through it with a spacer that I can use as a retaining bracket to ensure the shell doesn't bounce off the trolley when wheeling it around.