Looking for good candidate cores to use for making a Lark Club Car using sides from Union Station Products. I know the articulation ends will be a pain, unless the donee is a Kato 3 car from a daylight set. Hrmm now that I say that, how would say using 2 Kato 2 car articulated coaches work?
I would think that just about your only option would be a Kato triple unit diner since isn't the Lark 'club car' actually a pre war (1941) triple unit Lounge-Kitchen-Dorm-Diner. Since the Lark was a night train, they wouldn't have had a club car. I have in the past (way before the Kato sets came out) modeled two car articulated sets using ConCor passenger cars. Didn't really care much about the exact length of the cars at the time (something was better than nothing and they were about the right length) but you might be able to use them, especially since you are replacing the entire sides of the cars. Good luck with this and I expect to see pictures.
DesPlaines Hobbies has a kit for the Lark triple unit diner that consists of American Limited style core kit components. Charlie Vlk
I looked at DesPlaines, and saw nothing so asked them, and they said they used to have the Shasta triple, but not the Lark, but even that is now gone.
I would second the Kato daylight coffee-kitchen-diner. You could save the roofs and probably the chassis. Scratch building the articulation point well enough to work reliably might be hard. With the Kato car to scrap, you get trucks, interiors, and the diaphragms.
That's a tough one, I really love the SP articulated cars. I agree with the other guys, I think the Kato daylight coffee-kitchen-diner is probably the best place to start.