Up close and there is plenty of depth to the back panel area to allow for a lot of custom cabling, and the CPU access hole is large enough for most well placed CPU sockets.
There is a lot of airflow around the top of the chassis which is also mostly unobstructed front to back. We had some concerns around the drive caddie getting in the way of the PSU cabling, but with the angles required to loop round the back, it doesn’t get in the way.
There is also a good amount of clearance for long graphics cards. The chassis doors also have a noticeable depth to them, allowing for good clearance both sides. It also looks possible to remove, carefully, the window panel from the door, in case you have something else in mind.