Hi Gordon,
The flow chart you're describing sounds like a modified CH rating. There are plenty of them out there.
As to cockpit compartment view - I'm assuming that you've looked at FAR 23.773, 777, 1311 and 1321. These regs are useful to define what goes where. If you're working with a Part 25 aircraft the corresponding regs are in the same sections.
The trick to modifying the CH scale is to know how it needs to relate to the regs outlined above.
I've recently modifed a ProLine 4 flightdeck to a ProLine 21 deck, prepared another to accept SVS, and I'm about to modify an Epic equipped flightdeck to a ProLine Fusion one.
Cheers
FT