Finished build with one GPU, but Forza got a bit choppy at ultra settings with faster cars. Broke down first build and set up the SLI.
The case is gorgeous, but not great with airflow, no surprise there. To compensate, installed 5 NFA14s. After putting in SLI wanted to optimize airflow so the louder GPU fans wouldn't kick on as often. Made burnished aluminum brackets out of raw stock to place fans where necessary, but unintended by the manufacturers.
One NFA14 is blowing directly into the STRIX SLI and a Corsair 140 from the h115 is attached to the outside pulling air out of the case below the top GPU outputs.
Also installed 6 Aigo RGB fans, more for looks than airflow, although they do move some air.
Comfortably bumped the CPU to 4.0 MHz with the voltage at 1.35 and bumped the STRIX SLI graphics to 2037 MHz and the Memory to 5904 MHz without increasing the voltage. Computer is stable.