Hey, I dont know a great deal about concourse judging, but I do know that moca has a completely different view than the us on what is concourse and what is not.
Better off using just the moca guidelines than anything else, as it has more room to move. Replacing parts with available parts in that model year is acceptable here, however some judges in the us would ping you for not having the factory fitted single exhaust that is listed on your marti report...
I am going down a similar route to you as far as replacing everything with original parts, but I know I am not going to dish out a million bucks to put the correct finishes on every little thing, so what category does that fit into?