If you don't plan to overclock, then that cooler is fine. If you do, get some Noctua/Be Quiet or similar air cooler (maybe even a Nepton 280L, if you can get them cheap). Get ram in 8Gb sticks. Dual or quad channel won't improve anything for work, but it'll be much easier if you decide to add more ram later. Look into the real life GPU performance of Revit. I don't use it, but 3dsmax and Autocad don't really benefit from a "Pro" gpu at all. So a good gaming gpu in the same price might work much faster. Like ThisHertz mentioned, you just loose 10bit support. For R5 I'd say adding one more cooler would be enough. You don't really need 5. And for that one, I'd say buy a Venturi series from Fractal. They are better. The rest is fine, and mostly depends on local availability/preference.
We were able to get a 50% discount on the video card so I think I'm going to stick with a workstation card for these two builds. I'm not planning to overclock the CPU so the air cooler should be sufficient, I have built two other machines with the same CPU and cooler and have not had an issue with them yet after 8 months.