I'm going to step up and say you have the rarest rotary car on this forum.
I'd love to see pics!
Have you looked into ceramic seals?? I've read that the early NSU rotaries suffer from more wear and tear than the Mazda rotaries (rebuilds aren't uncommon at 50K miles) and ceramic seals (apex and side seals) might help with the longevity of the NSU rotary.
N.R.S. Rotor Sports
Edmonton, Alberta
http://members.shaw.ca/nrsrotorsports/index.html