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I hope it's an exercise in planning rather than you have all theses modules and you're stumped!

in addition to farkas' excellent questions - here are some thoughts:

sequencing/quantising: there is massive overkill even for using sinfonion - I recommend 4-5 sequencer channels - if you want to add more random then a single permutation/pachinko is sufficient - personally I would go for Marbles instead of either pachinko is a clone of marbles and less ergonomic - and marbles is like a triple turing machine - which permutations is derived from - one of the sequencer channels should be completely independent (ie run at a different speed/separately clockable) and programmable - this is for switching song parts in sinfonion

metron is a trigger sequencer - mostly used for programming drum patterns - I think this is completely superfluous - unless you are planning on using the bitbox for

I would try to think in terms of

sound sources < sound modifiers < modulation sources < utilities + sequencing and final mixing

I would also when trying to emulate tangerine dream (or any other music based around multiple movements within the same piece of music) think in terms of layers of modulation - how to alter volume of parts over time?

sound sources: I see 3 modules - plaits, t-sl v2 and chainsaw - plus the bitbox (which I know nothing about) which I am assuming that you are intending to use for another 3 voices - you really want 8 v/oct inputs for voices - so this seems about right in terms of number - not what I would have picked but fair enough - that's personal taste - although I would probably want 2 or 3 of the same analog vco

vcas: definitely very light on the vca front - 4 vcas (yes I know that plaits has a built in lpg) I would want at least another couple of quad vcas in this case - they are needed for much more than note shaping - automated volume control over time and modulation for 2, which brings us to -

envelopes/modulation sources: there might be just enough envelopes, but then there will be a lack of controllable lfos - I would be tempted to add zadar and batumi and a matrix mixer to make modulation more interesting - mix modulation sources - possibly might need a couple - I might remove o&c

sound modifiers: plaits has a built in filter/lpg and chainsaw is stereo - the filters you have are mono so would work with individual outputs from the bitbox and the t-sl - I would probably dump all of them in order to get 1 or 2 more ergonomic mono filters and add a stereo filter for the chainsaw - I'd also want more in the way of general effects - a single mimeophon and beads are not really going to cut it for that many sound sources - I'd probably add at least a couple of fx aid xls, probably more

utilities: not really enough in this size - I've covered vcas and to some extent mixers (matrix mixers) above, but you will almostt definitely want more mixers - for panning and cross fading I would learn to patch these from vcas, lfos etc, but there is not a lot in the way of other basic utility functions - I would spend a decent amount of time researching all the different sorts of utilities and how they are used and an equal amount of time thinking about how these can be incorporated in your patching of this synthesizer (I'm talking weeks or months here not minutes or hours)

end of chain: how are you planning on listening to this? personally I think the eoc mixing solution you have here is woefully inadequate - I would look at the equivalent of a battleship eoc mixer - either the wmd performance mixer or something that is expandable such as the tesseract modular tex-mix (I have this one) which is extremely flexible as it is expandable 4 channels of mono or stereo at a time (and better yet more cost effective and lower power consumption than the wmd perf mixer)

I'd also want some effects on the send bus of the mixer - probably some reverb and I personally like the lofi setting on the fx aid as an eoc effect - so possibly another couple of fx aids and/or a very nice stereo reverb - the new strymon starlab looks and sounds very good for this role

if starting from scratch go very slowly - build a single voice chain (sound source, modulation source, sound modifier, some utiltities) and work from there maybe planning to add another module or 2 every few weeks or months towards something similar to this over a period of a couple of years - otherwise you will probably be overwhelmed

additional after looking at the bitbox further - if you are intending on using this as a sample player for 3 melodic voices + some percussion - I would probably want a more sampler with more channels - or multiples of this - I'm not going to recommend anything for that though as I know nothing about samplers in eurorack

EDITED Nov 8th 2021, 17:12