Side fans directly over the vrm, and ram. PSU blocks about half of one fan on the GPU.
PSU is mounted to the lid with a short extender to work as a pass through.
Four side fans are intakes with the fifth fan being a top mounted exhaust.
I cut all the holes out by hand with a dremel.
Cut the tray out of my old case, and mounted it with brass standoffs.
Updraft
I like to make things. So why not make my PC case. The chassis is a repurposed mil-spec cargo box with the Mobo plate cut from my old case. What you end up with is considerable cooling potential from a pretty small foot print. The military surplus box is made of 8 gauge aluminum. 3mm of aluminum sinks a lot of heat. Coupled with four filtered 120mm intake fans, and the 200mm top mounted exhaust fan centered over the cpu. CPU, and GPU, idle around 29c.(8c over ambient) CPU peaks around 52c under load. GPU around 72c under load. All in all I'm quite happy with the build. Runs cool and quite, and there is plenty of room. If I had to do anything differently I'd probably pick a theme and paint the case.