Yes, that's a very good point with the case, I had thought about how they draw you in with the fitted stuff, and likewise I agree that something as simple as a metal plate to fill a gap can keep your wallet happy lol.
You mention about predominantly using cv/gate and not midi, can I ask for curiosity sake when would the use of midi be required as opposed to cv/gate?
As is clear, Maths is an extremely useful module, I probably need to dig into it a bit more to understand it's full capability (if that is ever possible :P) so I'll look more into that. Thanks for all the other tips, it is really about establishing that starting point and building from there, and it's just those starting points that I need the ideas/suggestions for.
In regards to listening to the Matriarch, my current setup is directly from the main outputs into a Saffire pro 40 interface. This shouldn't be affected by the use of Eurorack as long as I patch everything back into the Matriarch mixer right?
Thanks again, already helping me get to grips more bit by bit!