Thought you might like a bit more Snipe information from me. About five years ago I started doing research into Snipes as the aviation restoration company that I started about fifteen years ago had the remains of several Snipes with serial numbers etc.
I managed to collect an almost complete set of original Sopwith drawings and all the parts lists etc. The major snag at the time for a restoration project was the lack of availabilty of the BR2 engine.
Also, more importantly, there were almost no drawings for the engine.
As our company, Supermarine Aero Engineering, was a major supplier to the RAF Battle of Britian Memorial Flight and we made parts for the Royal Air Force Musem for some of their restoration projects, we were able to arrange to borrow a BR2, dismantle it, measure up all the parts and produce a complet set of engineering drawings. The quid pro quo was that in return we would make some parts for one of their BR2's that had some parts missing.
There was also the possibility of a restoration project for the museum as they had a load of Snipe parts to form the basis of the project.
I did see the Harry's Bentley project on a link to your blog. I think he based all his drawings on the quarter scale model that he had made before embarking on the full scale engine.
Unfortunately the whole Snipe project was put on hold before we started due to the work load in our main business. We had taken on the job of manufacturing a new set of main spars and an new fuselage for a Mk 46 Seafire along with our normal work load of Spifire parts supply to all the warbird industry operators and restorers.
Anyway coming back to the Snipe, if I can help with any info that you may need just give me a post.