Another artist on the Forum.....I wonder if there is meaning in that. I majored in drawing and sculpture way back in art school, ended up making a living with photography and now back to the drawing.
I have a BSA instruction manual
for C10L and C11G. It's just a little 87 page 4 by 6 book but has a lot of good info in it. It would be later than 46 as it includes both the old carb and the Monobloc
and has good sections on motor and cycle servicing. If you don't have one already and think you can use it I'd be glad to mail it to you.
I can certainly appreciate the joys of working from a basket case start but the bits usually turn up if one looks hard enough.