I think Terry makes them for specific locos, and many locos used in Oz have outside frames as they are 32mm or 45mm gauge adjustable. A unit designed for a 32mm outside frame chassis should fit any 45mm gauge loco? But don't listen to me - ask Terry!As far as I can tell his setup only fit under outside frame locos, or in cars. I'm starting my project of building one to fit my Ruby.
You are having fun. Have you looked at the improved throttle spindle that Jason at TTD sells?I need to tame my Ruby