So, I liked the setup with multiple dual VCAs and two VCOs, but I don't like having the same module multiple time. For me a fundamental thing with modular is the mixing and matching of brands and unique takes to create one system.
-- Alltvin
Bad idea. So, let's say you have two oscillators, one being a Plaits, the other is a basic VCO. You'd LIKE to get the Plaits to sound really huge and fat, so you...oh, wait! Your VCOs don't have anything resembling the same waveform, so you can't exactly do that, because that detune trick requires (when done right!) two identical VCOs with identical waveforms, and if one's a Plaits, the other should also be a Plaits.
The same applies to the VCAs. Since those are Veils-topology VCAs, they'll all have the same sort of operating method, the same(ish) sweet spot on the variable response, same sort of gain factor, etc. That way, when you set one in the voice chain, the same sort of settings are applicable to each pair. This makes it much easier to get a patch set up, but if you go with all sorts of different VCAs, you won't get that. For example, in your new example, there's one of the After Later duals...but then, the next VCAs are those Doepfers, which DON'T have variable response. So if there's a certain curve you like on the After Later...well, that won't be happening with the Doepfer.
Couple of other things...for one, you really won't find much need for the Pam's MIDI expander. If you want to lock up drums to the modular, you can just use one of Pam's trigger outputs as exactly that. And if you need the drum machine to be the master clock, just send its timing sync from the machine to the Pam's clock input. Solution simple. And as for the question about the A-118-2, yes, the intention was to provide a noise/random source AND the sample and hold. You now have neither, save for the 2hp dual...but without any random sources, you can't use those to S&H noise/random signals to get a random CV output. But worse still, if you want to add a percussive "hit", you're now missing the audio source that you'd probably use for that.
Tell ya what...instead of progressing further with the hardware build, get hold of a copy of VCV Rack, and explore the why behind things like the identical VCOs, VCA behavior, and so on. For the most part, you should be able to put together various bits (I know there's Mutable module clones in the set) that explain the issues. VCV's free as well... https://vcvrack.com/