Got to use the A12s and N72s today for tracking and man did these tracks turn out great. A12s were very punchy and the N72s definitely made the vocal track.
As for my wish list iten, Id love to see an EQ for this chassis.
Something inductor based, 1 or 2 band, concentric knobs like the B16 for Freq and Boost/Cut, the switch selects 3 different bandwidth patterns from Notch, medium and wide. You have 2 more holes so either repeat in a different frequency range or use is as a low shelf/high shelf with the switch for a bypass or a low cut. Transformer balanced with a flavor like that of a 1073 would rule. I think it could be done on to fit on the standard SCA PCB footprint as well.
Alternatively, something Pultec-ish could work as well. Concentric knobs for the Boost and Atten. Switch Selects Freq. One set of knobs and a switch for the low and one set for the highs. Again, I think it could all fit on a SCA PCB.