Gee Two,
I'm just calling the drive train a butterfly, because that is what it looks like when you look at the top view. Dropbox, has the link working for me (when I'm not signed in), I'm not sure why it isn't working. The design of the robot is a Kiwi, that is not at an equilateral triangle, but an isosceles. all the wheels are 120 degrees from each other, so they would be 150, 30, 90.
Picture of the Base. the three wheels will be 6" VexPro Omnis.