I have a couple U30Cs and C30-7s. Half have the old chassis and half with the new drop-in decoder chassis. My hope was that I could simply swap the shells so I could drop in some decoders to get some BN power operational for this next op session. One fit on the swap, the other, not so much. Sadness! I may have to order another CN-GP decoder to get it running. I'm already wary about this install now. I may see if I can farm out to a friend of mine.
See how the shell doesn't sit down fully on the chassis. Sad!