RE: Tam DMD units
Believe it or not, I think in the long run it would be cheaper to buy the kit at a good price and then you could part the rest of the kit out, build the remaining as just a model or sell it off minus those parts.
With the kit, after you add up the electronics all the hardware, the gearbox that could be added to the PIII, the recoil, decals, cables, etc. I believe you can get just the electronics from the Danville museum and probably the kit too.
HTH
Jeff