Aha! Thanks Nick for spotting all of that.
FYI the VIN on the bike is MC181004427 I'm assuming it IS for sure an R2J?
So I think have two choices to try and make the integrity of the bike solid/so everything fits...
-source those upswept pipes, foldaway pegs and exhaust hangers
OR
-find a correct R2J subframe, blast it, powder coat it, and work out some clever way of anchoring the existing pipes.
STOP PRESS: Jauce to the rescue...probably won't be cheap but could anyone verify this as an R2J subframe? (PS after re-re-reading Wayne Gardners 25yrs of neglect thread and studying the pics i realize the answers to everything are all there in black and silver!)
https://www.jauce.com/auction/u1169974937