I'm building a custom spitfire joystick for my sims... Phil at Authentikit provides all the design files for free. He's trying to start a 'maker' community devoted to building controls for Flight simmers. The next project will be a throttle control and soon a trim wheel. Very nice to have these in VR- much easier to find than a button on a keyboard! Oh, and another chap is supplying ready made kits with all the wiring and electronics needed. There's a link for that on the Authentikit page.
Here's Phil's site: https://authentikit.org/
There's a discord page too- he has links to it on the main web page, but here's the URL for it if you'd like to check it out. Very helpful group! https://discord.com/invite/2nhxP4KD6b
I'm surprised at how inexpensive 3d printers are becoming, and how much fun it is to actually take stuff from an idea to a drawing to a 3d object to be printed.