BennyB, I have a thread started on the half track conversion from a torro M16. Its a week or two back go look for it. No gun mount yet, just got my book with the cut aways for reference.
I have been living on the shaddock Sherman site lately doing research. I have two tanks in build and back burner plans for a Jumbo 76.
I came a cross some micro full rotation servos that will be coming my way that I am going to try for elevation. I am going to try to make a servo recoil as well, we'll see. I might result with a Tamiya, you never know.
Tonight, I am going to try to get the HL rotation system moved over, that is going to be the most challenging part of the project I believe.
You can never have too many Shermans.