So, it's a Hamer neck and Thunderbird wings? From a Chaparral bass? I had the same done 'cause I hated the bodystyle and it being a CH-12 I wasn't destroying any expensive USA Hamer. My friend bult me a B12S style body and after some pickup experiments it now looks like this:
The neck was sawed off and glued to the new body. The original was some very light and soft wood, the new is alder and it resonates much better. Dives like hell but I'm somehow used to it with these kind of instruments. Might explain why Hamer offers this bodystyle only in short and mediumscale versions...
I'm planning to do a similar thing with the Hagström lurking behind, maybe a Swede styled body. It has a bolt-on neck so the whole project would be much easier.