Hi Nile,
I know this is a few months late, but I am sending a PM now.
I still have 3 of Richard's machines and I do not know model numbers anymore. I'll drop the photos here as well for the benefit of our members.
EDIT: I took the time to make up some decent photos.
The brass body enclosed turbine is..... a ST-215
The aluminum enclosed turbine........ a TS-315
The brass open rotor model is.........pretty!
Dave