Petermc, here is a laugh about opportunities lost, I never looked at your bike side on and it is only this morning when I looked at the lovely photo of your bike at the Rex lookout that I realized that a solution to a mutual problem may have beckoned. You see, your header pipes are not R65 pipes, they were meant for a bigger engine and as a consequence they do not tuck in nicely to the frame.
I have a similar problem because I have R65 headers fitted to an R80 engine.
Ah well, if only I'd realized at the time.
If you are interested in another BMW project, I know where there is one that is "all there" but has sat in a shed for a decade or two. Let me know if you are interested, I might just buy it myself. so my wife would be grateful if you bought it.