I've found so much stuff I could now build one myself. The trouble is that I can't match all the features. I have been working ignoring the "scoops".
From the various articles on it, including a fairly comprehensive one, it seems that people have adapted the plans somewhat, hence the modified tail on one, and the removal of the scoops on both the aircraft I have found photo's of. The common factors are the PA-22 parts, and the engine.
To confuse the issue further the aircraft is known by two different names....I'll accept either. It is in Aerofiles, albeit without a lot of information.