You're going to have a heap of "fun" on the software side of things with this setup too - trying to control it all. Going to dither at all? Then you need to coordinate exposures to ensure all are finished before dithering. If you're doing L,R,G,B,Ha - you might need different exposure times.
Then you need to consider flats - going to do those, or just process them out?
And I suspect you're going to have a lot of issues trying to control it from one machine (USB ports/connections). Probably would be much easier with INDI than ASCOM, but that's just guessing on my part with no real world testing.
If you just have 1 filter per scope, you should be able to use a good achromat - no need for an apo. That would save cost.
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