I have a submission for the knobs as well. I can't do fancy renders like you guys, so I did my best drawing my ideas.
And a description of my idea:
Originally, I had the idea of making artisan "caps" for the rotary encoder. I drew a few fun designs, but I know that it would be hard to implement in a mass scale. While drawing the designs on the left, however, I had the idea of "what if we made a rotary knob that had a standard mx shaped stem on it?".
I don't know the dimensions of a rotary encoder, so there would have to probably some modifications (eg. making the knob taller), but the idea is to have an mx stem mount on the knob, so you can attach your own artisan keycaps or even make your own traditionally shaped knob with an mx mount.
Hope you like my doodles!
Here is a link to the imgur album (of one picture, lol):
https://imgur.com/a/SmjMtZH