I have only just found this thread, - how did I come to miss it!
What a magnificent motor bicycle this is going to be. I am deeply impressed.
And it's powered by two side valve engines! I love sideys. Back in my 20s I build up a full race 4 cylinder 100E (English) Ford engine. Fully ported, relieved block, highly modified oiling system. Everyone said i was nuts to mess around with a side valve engine and I thought they were nuts right back at them for not seeing a side valve engine's potential. Those old 100E engines had a forged crankshaft in them that was just about unbreakable.
Sorry to hi-jack the thread with my rememberings of past glories, but I can't help it I just love side valve engines.