The Atlas cars are 60' cars based on a C&NW prototype. However, they do have the right look. If you could take those cars and splice in 3" to get the the 72' buffer to buffer distance of the CNJ cars you would have a fairly accurate representation. For the observation use just the end of the GGD car on an Atlas car and you get closer. The diner being an 80' car and originally an all wood Pullman Palace car, could be replicated using a GGD base 80' coach by replacing or heavily modifying the sides and adding truss rods to the bottom.
The nice thing about the GGD cars is that they disassemble with a screw driver into flat parts. The P70Far might look good from the window standpoint as a starting point and then using the full clerestory style roof profile from the original run P70s.
From the standpoint of the locomotive, the MTH model probably makes the best stand in without having to make modifications.
I am actually after the coaches myself for their later use in commuter service, but any and all ideas on how to pull those together in a believable way would be most welcome.
