Taking a quick look at the Gecko ITX S Mini-ITX case. This is a sandwich-layout case that is highly compact, yet still allowing a full-sized GPU. It features side and top panels that are 40% air vents to allow for high airflow.
Check out the Gecko ITX S here: https://geni.us/ClEY
Check out the other Gecko cases here: https://geni.us/nBn7I2k
Check out the official YouTube channel for the Gecko cases here: https://geni.us/F14J