Hi Scarfey,
Steptoe an I had a bike workshop day yesterday and after seeing both bikes naked side by side, I'm hanging out to see your photos of the modded frame you have. Compared to the Special frame, the RH has got gussets everywhere compared, and a few extra short tubes where mine has none. Please put a pic up soon mate, so we can see what you've got.
We're going to put up some comparison pics when we put my new carb diaphrams in.