My concerns here are that there's too much attention being devoted to aesthetics and not enough to functionality.
-- Lugia

Thanks for your feedback, Lugia. I hear you, and I reckon that I could cram more in a smaller space by mixing and matching. But given what I've presented here and the stated aim, am I actually falling short functionality wise in the sense of failing to realize the aim?

To fill in the background a bit, I can confirm that I will be the only audience; this is a hobby instrument for my own pleasure, so aesthetics has its place; and I think the risk of an endless search for novelty/increased functionality is a real one--folks confess/lament it frequently, so I think a strategic buffer against that (by aiming to stick to Doepfer) might be wise.

Note, though, that you can get away with only linear VCAs in a build as long as you have exponential EGs to make them conform to the exponential loudness curve. -- Lugia

Any insight into whether these Doepfer EGs are exponential?