Absolutely stunning
Only thing I can think of - does the handbrake need adjusting? It looks like it comes up quite high. When I sva'd my Robin Hood I got a failure point because the handbrake came up to near the end of it's travel or some similar wording. I had to adjust it so it only came up 3 clicks of the ratchet. the exhaust clamp may be an issue as well. Cant see from the photo but it looks like there may be a sharp edge on it. You would get away with it if it was below the level of the floor but it could be an issue where it is. If the bolt is hex headed and it can be done up by a spanner just rotate it so the adjuster bit is between the pipe and the body so they can't touch it with the test sphere. Hope that makes sense - it's early!
Best of luck with it, you have built something quite remarkable there, it's quite an inspiration.
Dave.