I would love to see the temps you get with this set up as I was planning on doing something very similar.
So got a chance to try this today. Hooked up everything andI spun it at 100% usage on all cores for an hour, though temps had stabilized by 10 minutes in.
This is an E5-2680 v4 which is 100% legit and not at all an ES from China with about 100mhz lower clock (still 120W TDP), with a Dynatron T318 heatsink and the 18x120mm fan from an Akasa Nero Lx (64 CFM, 2mm H2O static pressure). This combination basically just baaaaarely fits in the case. any more would definitely be right out. I'm considering shaving a bit off the bottom of the fan so it's not as tight.
Anyway, results: Idle is about <30°C, max temp it got to is 63°. I didn't check chipset idle but high for it was 43°. Basically all in all much better than I expected, and I don't see any cause for concern. No throttling on the CPU either. SSD will have part of that fan right above it when I get it, and the board's not getting crazy hot so I expect it'll be fine too.
Anyway, just waiting for my SM961 to show up (mid-late August probably), and I need to make some nice short cables for the power supply, and I'm good to go.
P.S. I asked about using the PCI riser cable Josh sells to install a single-slot card in the bottom slot and I can say definitely I'm pretty sure that won't work, now that I've tried it. At least not without bending that riser a lot more than it feels like it wants to be bent, anyway.