Nope, but If one showed up on my desk I would gladly do so. ;)
I've programmed a mecanum drive system quite a few times over the years, The algorithm is dead simple!
I've also built a three wheel'd bot very similar to that as well but I never got around to putting a controller in it.
In either case, my experiences have shown it to be very important that you incorporate a gyroscope into your controller to keep the robot moving in a straight line, unless you are just going to drive it around with a joystick.
All the best!
~Dereck