I don't think Lugia is necessarily suggesting to buy a bigger case!! although I would strongly suggest that 104hp is a much more sensible starter case - and is still very portable, unless you are a small child!!
the idea is to create a much bigger rack on modulargrid so that you can add all the support modules that you actually need for the shiny black expensive modules that you have thrown in you rack and work out each voice so that you can work out how to have fewer voices in the same size rack you have here, but with the support modules that are needed to effectively play it and to be able to patch and repatch in multiple configurations - there is no point buying a modular that can only really be patched effectively 1 way
in doing this you will get a better understanding of what you need in the rack and not just what you want because it looks cool
make copious notes - how you would patch the synth etc etc taking into account things like how you will mix, why are there stereo outputs on the erica dsp, but nothing else is stereo (except the fx aid - I'd go for the XL - more modulation inputs - and probably 2 of these over the erica dsp) - how do you take a mono voice and send it to stereo (panning mixer?) the erica dsp takes the same mono input and copies it both left and right and then processes it - you have no control over this!
I hate odd sized modules - says he thinking very hard about getting an erica seq (it's the cheapest smallest sequencer with memory - i wish it was 4hp and not 3 though!!!)
it will lead to hard decisions - almost definitely remove voices or get a bigger case - or use a smaller sequencer - the nerdseq is overkill in this size case
once you have made the hard decision and implemented it in a modulargrid rack - come back here for a second round of is this actually a workable synth
"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