I’m not an expert but I wanted to build my own gaming mini-PC. I followed this guide step by step, which was super useful because they were giving useful tips to make sure everything fits and works correctly: https://techbuyersguru.com/reviews/building-a-small-form-factor-pc/ (they update the config each month so the current guide is very different from 5 years ago) But, in retrospective, I think I should have gone for a bigger case because there is basically no other GPU that can fit this case anymore.