I did a project similar to this previously so that I could have built in NES ports that could use any controllers from any manufacturer work on the Xbox without any modifications.
My friend really liked this design so he asked me to build one for him as well. I call it stealth because it can sit under your tv and guests would assume it's a receiver or an amp.
The xbox is soft modded with the usual stuff and runs cooler than factory with my weird setup. I didn't want to waste two iceberq4 fans for a non slim build so instead I bent some pins and threw in a Noctua fan. The picture below is a mockup before completion as I forgot to snap more pics before I gave it to him. It's been 6 years and it still running strong
I originally had a different xbox in mind for this with a Chameleon mod chip, if I remember correctly. The previous owner let the capacitors leak resulting in it always powering on when plugged in. I was ok with this, given its use case, until it caused issues when running so I quickly put this softwood together for him instead.