With regard to panel size, that's one upside of the older OB-X(a), compared to the OB-6: the large indicator knobs (previously used only for the Oscillator Frequency and Filter Frequency + Resonance on the SEM) are a joy to work with, compared to the smaller knobs used for all other SEM controls, and the majority of the mid-80s blue-banner Oberheim products. The spacing visually counteracts (IMHO) the texture of the blue pinstripes, although I still prefer in many respects the look of the original OB-X.
I didn't find the Karp Odyssey reissue to be wrong-sized as regards the panel; 7/8 size is workable (equivalent to 42/48 scaling, which is well workable for something along the lines of a Jupiter-8 reissue. (Roland, are you listening?)
I'd buy one of the modules - and, if they add some sort of poly-chain functionality, hmm - that could be interesting.