Very, very nice work. I will definitely be interested in your SD90 project; I've got one awaiting the treatment, but only so much time. Trust me, I agree with Doug, about the variations in doing these things, but on the other hand, some MTH models use common pilots (for example the SD90, SD60 and SD70s all seem to use the same pilot), so I expect that parts like these will ease the job. And those are very nice parts.
RM