Hi Vincent
I think you are trying to do too much in too small a space
too many voices - I generally think 1 per row is enough - 1 1/2 at a push - you have 2 1/2 per row
this is because you won't have the space for the modulation and utility modules that are needed to support them - unless of course you aspire to perform like you are on crack - see frenetic modular influencers and 'artists' who constantly touch and micro adjust knobs - this is what modulation and utilities are for people
saying that I think you have enough modulation - maybe too much - but no way of doing interesting things with them - combining, multing, modifying them - not enough utilities - I don't think 6 vcas is enough for 4 sound sources, even if some have built in ones & where are the submixers? and how are you doing final stage mixing? mix up? not enough channels so you can listen to all the sound sources at once!!!
NB regarding vcas - they are useful for so much more than opening and closing audio - they can also be patched as compressors, crossfaders, auto-panners and are fantastic for control voltage
rainmaker is a huge delay - and a lot of people seem to buy it and then not get on with it
midi/sequencer/pams - all have built in quantization - the scales is redundant - especially in this size case
I would keep only 2 of midi/sequencer/pams - I would drop either midi or sequencer and if I kept the midi I would go with a midi interface that can support hte number of voices in the rack - I count 5!
I'd probably also go for a better melodic sequencer - especially if you want to dial things in easily
NB changing 'chord' and keeping disparately sequenced melodies in key - ie changing a major to a minor or vice versa is quite difficult in modular - there is a brilliant solution - sinfonion, but it is large and expensive and only really of benefit once you have a polyphonic voice and at least 3 others
a good ratio to start thinking about when planning a modular is:
sound sources < sound modifiers < modulation sources < utilities
and start with modules you want - add what is needed to support all these modules and leave 30% free for expansion (add 10mA/hp/rail for power to be on the safe side) and then find the right case for you
these last 2 statements will save you money (eventually) - maybe not to start with in that you will end up with a bigger, probably more expensive case - but in the long run as you will not end up buying/builidng cases as a hobby
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities