So, yeah. I'm thinking about finally going for a full custom loop, it would be my very first foray into water cooling and as such I have quite a few questions for the veterans. The pictures included are my case with a small diagram of my planned loop + my shopping cart so far. I've already done the bulk of the research and asked around, so as far as I know this should be everything I need (I already have a whole bunch of excellent static pressure fans for the rads). If I'm missing something, if I don't have enough tubing or if the pump is somehow too weak for what I'm planning then please point that out, those are some of the things I'm worried about right now.
Fan setup: would my diagram be alright when it comes to airflow? I could also get rid of the bottom fan and go for push/pull on the 240 rad instead, I just want to make sure that I have positive air pressure in the case and that everything works out fine. Also keep in mind that only the fans on the rads are 120mm, the remaining fans will be 140mm ones that are controlled independently.
Rads: From what I've read those rads are excellent and I suppose 360 + 240 should be enough for 2 GPUs and a CPU when they're that thick. I've checked compatibility and they'll fit just fine in my case.
Pump/res combo: I've heard that those 5.25'' bay units can be a bit noisy, but it seems like such a nice solution. How hard would it be to fill that thing, I assume you'd connect all the tubing and then lean it out of the 5.25'' bay to fill it, do all the filling and bleeding and once that is done close it up and push it back in the 5.25'' bay? How hard would draining be with my setup in general or with that res in particular?
Fittings: First of all, wow they're expensive. I'm pretty sure I have enough (2 for each component). My question would be, should I go for quick disconnect? It would be even more expensive and they add more resistance from what I've heard. The 4 90° adapters are also in my diagram, the blue circles.
General questions: "is it worth it" is a silly question, I know. But I'd just like to know whether you'd do it for my current system, with 2 R9 290s, when I'm probably upgrading in a year or two anyway. I could also wait for HBM 2 cards and possibly Zen and just do the whole project when I swap all the components anyway.
The risk, how likely am I to screw up on my first attempt? How likely is it for a leak to appear during use? How likely is it for the pump to die without noticing it, etc.
Am I overspending on certain things? Buying it all from one source is convenient, but EK might have inflated prices on some components, I don't know.
Is it really the best solution to just buy reference cards and then OC them once they are under water? Isn't the power delivery a limiting factor on the reference designs?
How many parts can I re-use across multiple builds/years? I assume everything except for the GPU blocks, right? The water-block is universal and fits virtually every modern socket (and hopefully future ones as well), the rads and tubing and whatnot should also work just fine in several years, maybe you'd have to swap the O-rings on the fittings. The GPU blocks are what's going to be changed every GPU swap, but I hope that they'll sell well with the used GPUs.
I guess that's about it, thanks to everyone who takes the time to read and/or answer this.