Hi Nik_Neves,
Amazing and very interesting how compact you can keep your system :-) Just for future purpose, it's perhaps an idea to start with a bit bigger casing, 9U instead of 6U; or wider? Sooner or later you will need the space...
The Dixie as you mentioned to use as VCO and/or LFO is fine (though there are cheaper and smaller options) however only one VCO/LFO in the entire system? Personally I would like to have at least two VCOs and one LFO but naturally it's up to you to decide.
If you don't want an ADSR I guess the Quadra as a quad AD or ASR should be sufficient. I actually would prefer to have at least one full ADSR.
You have a quad VCA and quad AD/ASR, okay but I only see a single filter and a single oscillator, are you going to be okay with that?
Have you thought about an audio output module? I can't find that here.
Good luck with the planning and kind regards,
Garfield Modular.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads