The Challenger "SE" models also had the overhead consoles and a reduced size rear window. I don't recall the headliner material but you could be very well correct on the cardboard. I had a 70 Chally RT/SE 440-6, Auto, Dana. I paid 1,200 for it around 1980. Boy, I wish I could have that one back...!
The only Cuda that had a headliner of cardboard would be the overhead console optioned units in which I think we're only Grand Coupes. This, I would like to copy in my '73.