Well if you got off yer bum and came to one of the BSA Nationals you could have very well ended up wit a ride on it. I don't think I saw Doug on it once all weekend. He usually brings it to the All British ( or the empire twin ) as well the only thing missing is you.
He likes a good engineering conversation so the two of you should get on well together.
The SOHC Jan Heemskerk bike was always a favorite of mine, out of all the BSA V Twin builds (apart from the real ones) I always thought this was the nicest finished. Its B50 barrels, Vincent rod, Norton box, Triumph cycle parts.