Looks like Bltzwing is going to do it for you
I did apeface a few years ago (from animated Blitz, funnily enough) and still want to do a Snapdragon, though my idea is based around the voyager sized Starscream from the cybertron line. Playing with the robot mode, all I need to add is some stubby arms (for a kinda Godzilla ish look) and of course a dragon head. The head is what's had me stumped...but now I think I may get a predacons rising skylynx, since I like how the dragon head is the robot head.
Will you be making yours a headmaster?