While I haven't made any design sketches yet, I wanted to quickly make a prototype so that I could get a feel of the size of the control panel and placement of the buttons and sticks. I threw something together under an hour using foamcore, cardboard and tape. I also had two Tac-2 joysticks that I used as a reference for the sticks.

I'm quite happy with the mockup actually! I found that its length was a tad too short so that the panel felt crowded when two people were using the sticks and buttons, but this will be addressed in the next iterations.