Besides the comments of Jim, I have another point to consider (actually a lot but then this is going to be a very long feedback, so I shorten this a bit).
Why would you need 3 ALM Pamelas? Wouldn't be one enough and if those 8 outputs are not sufficient then use multiples and clock dividers (and multipliers) instead of 3 the same Pamelas? If you must insist on more than one clocking unit (why?) then consider as a second module the combination of Make Noise - Tempo and Shakmat Modular - Time Wizard a great pair of modules that go very well together.
Please check the basic synthesizer setup of: 2 (or more) oscillators, noise generator, mixer, two (or more) filters, envelopes, LFOs, VCAs, some utility modules to keep Jim happy (just joking Jim), perhaps a ring modulator as well. Start with a bit more basic modules and functionality and then expend where needed. An audio interface (as in a module that exports (and imports) Eurorack levels to Line levels) wouldn't harm either for a setup like this. Vermona Tai-4 (XLR) is a great module for that purpose or Intellijel - Audio I/O (jacks) another good example.
From the look from your rack, I have a bit the feeling that you "suffer" from the nice sexy looking modules syndrome ;-) It's nice to have a few sexy modules but better to start with the basics first.
Perhaps the main advice could be that you should start with a few modules first, gain experience with those and adjust your opinion about future planned modules and see what's the next little batch of modules you might want to add to your existing modules, again gain experience, etcetera...
The very good thing I observe is that you straight away take a monster rack or going towards that, that's good :-) But please keep some free space reserved for future needs/plans/etcetera.
Good luck with the planning and once you get into it (or did you bought everything already?), have fun with it :-) Kind regards, Garfield Modular.