There is some DIY content in the Home Cockpit Builders section. Beyond that there is plenty of advice available elsewhere via forums, YouTube channels etc.
The CJ4 AP panel looks eminently do-able. The button caps might be a challenge, since they need to be back-lit, and I assume the buttons in the real thing are rubber? You can get sort-of rubber-ish clear 3D printer filament, though, and back-lit micro-switches. Depends on how visually and functionally faithful you want to be to the real thing.