Jim,
I remember seeing a 906 replica for sale on the Mecanic Import website(Belgium) a couple of years ago. I'm not sure about accuracy, but it looked pretty close at a glance(I'm no expert on 906s though). I have no idea of who the manufacturer might have been, but perhaps Mecanic Import could steer you in the right direction?
www.mecanicimport.com
I just looked at their site, and the 906 replica is still listed at 85K Euros.
Bill