[lylejantzi3rd]

Maybe https://www.reddit.com/r/ErgoMechKeyboards/ will be less intimidating? There are several designs on that subreddit if you search for "trackball." like this one: https://www.reddit.com/r/ErgoMechKeyboards/comments/12uqw3c/...

[lars_francke]

That looks interesting! For me a pre-built one would probably be ideal, otherwise it'll end up with all the other half finished projects.