I put the radiator for the AIO on the rear slot as an exhaust fan and put two intake fans on the front. As far as noise, the RX 570 fans are stupid loud under load. They spin up to 70-80% for some reason and it's at 70ish degrees, but I can lock the fans at 35-40% and still have the same temps minus the noise.
16 is a bottleneck for Threadripper, but it's your money you're wasting. Have fun.
But why? Why Threadripper with 16GB of RAM and 1070's?
At $5,000 it's obvious price wasn't the deciding factor.
You made some unneccasry compromises there.
Go Ryzen 5 route, 2600 $40 more. B450 mobo $10 more. 16GB DDR4 3000 for $66 more and an 8GB RX570 for $10 more.
$126 more, still under $700.
16GB of G. Skill 3000 Mhz DDR4 for $109.99 US. Could have gotten a bit more bang for not much more buck, but solid system to start on. That 970 3.5GB is going to hold you back a bit though with higher settings on new titles. Don't expect ultra on 4K.
First upgrades should probably be GPU and RAM.
Why would you pair modern components like a Ryzen CPU and DDR4 RAM with a GTX 660? You can get a solid 8GB RX 570 for $160 after rebate, and that would greatly out perform the 660. Hell, my still in use R9 280 blew my old MSI GTX 660 out of the water.