R, yes, I'm aware of the frame differences. I've done a quick measure up between the engine and CO frame and I think we'll be ok with some spacers for the gearbox plates. I also have another front frame which does have the correct dimensions but has a "moody" number.... Anyway, this is a real long term project. I'm no stranger to building bikes from bits and I see this one as a bit of fun really. If all else fails I'll just polish up that lovely engine and put it on a plinth!
REgards, Mark