Edin in Denmark sent in these photos of his recently completed B31 restoration:
Items that were made new are:
Brake drums
Front mudguards and part of the rear mudguard
Silencer and rear exhaust pipe
Handlebar - clutch and brake controls
Front headlight (Hella rebuilt to look like something like a BTH)
Primary and secondary chain guards
Luggage carrier and tool boxes
(+1000 other things!)
The bike is running well after 200km to sort it out.
Doug (for Edin)