Gotta be careful with the premixed coolant.
I know that XSPC use glycol in their coolant (for a fact - they told me!), which means that it can't be used with some tube types (PETG for instance will melt if used with coolants containing glycol). I think you are using soft hose, so it should be fine - but you will want to double check (the soft host I had in DSV for instance, would also have melted, if I had used glycol coolants. Not for the same reason as PETG though (PETG and glycol are ALWAYS a bad move, because you are continuing a chemical treatment applied to the tube already), whereas the tubing I had used, would have had a negative chemical reaction with any alcohol at all).
Got a question regarding the plastic panel you used for the motherboard tray (you may have already answered it, but if so - I missed it), how did you go about sourcing it? I'm looking for a similar type of material (different colour - of course) for Redlight District, but everywhere that I can find what I am after, are charging a metric load for it (cheapest for what I am after is $70)...