Runcam Thumb Pro dummy model

This is JoyMonkey's Thumb Pro model with the top+bottom air vents added, the USB port added, and the serial port on the back recessed for easier printing with the back on the build plate. The locations of the vents and USB port are both very close to the real thing (I checked with some prints and a mount based off of this model, as well as with an actual Thumb Pro), but the internal shape may not be exact. It is pretty close though, and definitely good enough to make a mounting solution with those features in mind.