Front side.. Yeap... It is 220mm diameter fan hole. To fan like this. Here you can see better that 5.25" and slim slot combination too.
Off-side of case there is plenty (47mm) air behind motherboard to cable management. In "front" wall is mesh areas where is plan to get some hex style air holes to get air flow. I havent yet made hole to GPU but it is coming when i find somekind "standart" to it.
In this side is too that mesh where im planing to ad hex style air flow channel. If u add SSD-drive (about 10mm thick) to that Hdd rack it has like 20cm empty air both sides. i used my 25mm thick HDD as sample and made every slot work up to 30mm. Top the rack is just bend part of motherboard slab so it enchants strenght of case.
My flat mate suggested to me add wheels to back of "stands" and telescopic hanle in them so it would be like trolley in the end. not sure ifi do it... But im looking somekind way to move it around if needed + side panels. Any ideas?