84 mustang, compustar 2w900FM-A

Alright guys and gals here is a question. I have an 84 mustang, I plan on installing a compustar 2w900FM-A. Heres the trick, The customer wants to add two door poppers(shaved door handle's) and a power window module to control up and down. Is there a way to expand a compustar that much to be able to individually control all of those functions? Also what brands are recomended for window modules?

THanks

Jack