Some brain farts:
- attention to height parameters of heatsinks and other various things, maybe according to the I/O backplate. Generally not an issue, unless Asus and Z-chipsets, but who knows what might come up.
- photos of placement of power connectors (24-pin and 4 or 8-pin) and fan-headers
- fan-headers: true PWM 0-100% or just voltage regulated
- distance CPU socket from I/O and (first) PCIe socket to calculate heatsink placement
- attention to general CPU keep-out-zone for issues with blocks that have side inlets
- mention of useful BIOS settings like good fan control or refined OC settings, CPU-less BIOS recovery and potential RAM incompatibility issues
- skip the CPU/GPU performance benchmarks, it's 90% time wasted on 1-3% variations
- quality or atleast photos of power delivery components
- your usual detective work that uncovers deep secrets