The new Cougar Airface Eco RGB prioritizes airflow with an unusually porous front panel. With a full array of fans and a lighting controller, the mid-tower Cougar case is also economical for budgets. The Airface Eco RGB is in stock now at retailers for $109.99 in black and white colorways. https://www.notebookcheck.net/Cougar-unleashes-the-Airface-Eco-RGB-mid-tower-PC-case-for-more-cost-effective-cooling.964727.0.html
Wouldnt a slightly perforated side panel do better than a monster front holes, if the hot air is actively suck out at the top?
Depends somewhat on your fan configuration but it would definitely help. I think many cases are geared toward gaming setups, where gamers want to see their components clearly through the side panel.