Model 3 emulator uses is the mame romset. The roms for Model 3 board don't change in while as far as I know.
I am using the 775 svn version of Model 3 with mame 0.193 romset and it works perfect.
I am fucking retarded hahahah, for some reason I placed the game.exe outside the folder prg. When I put it inside the folder the coin enabler was able to find the process and the insert coin option appeared.