A model of a "mass driver," which is a large building/ facility designed to impart "launch" acceleration to an aircraft or spacecraft.
(Yes, I know that a real mass driver would have a much longer acceleration ramp.
This model includes geometry in the following formats:
It also includes the texture maps.
Just as a pointer, remember that this thingamabob is meant to be pretty large - the various landing pads around the base are meant to be big enough for a fighter or two - or maybe a small transport/ largish shuttle.
I would love to get credit if you use this, and would also very much like to see how you've used it.