Well said. The internet forums and the manufacturers of analog synth modules (small businesses, often working from their own kitchen) are taylor made for each other.
I hate to say it but I think your estimate is on the optimistic side. It won’t just be 2 sems and a keyboard. As you stated, I’ll bet there will be a midi type unit similar to what is used on his current midi-sem, it would only make good business sense that he would use a developed idea like that anywhere he can. He’s also going to put in a sequencer and a mixer. Remember, the SEM is a fairly basic synth and to get one with a power supply and midi or patched you’re talking $900. So to get 2 plus a sequencer, mixer, case and keyboard I think you’re talking well over $2k easy (and quite possibly voyager territory). Maybe if Tom looks into more volume production, prices will drop. If it’s any consolation I hope I’m wrong.
I’m not entirely sure, I think that the filter was based on the SEM LP and from what I know the entire synth was mainly discrete components. OB-Xa was the first Oberheim synth to use CEM IC’s afaik.