(Or how Asd would call it, back to b1)
This thread includes a download to a VMF of viaduct but with everything unimportant to it's structure stripped away. This means detail props, gameplay logic (spawnroom are left in), and most func_Details are gone. The file comes with basic clipping that is a little rough around the edges and doesn't have any optimization. I figured I shouldn't go through the trouble when anyone using the VMF would be modifying it a lot anyways.
Each teams side is signified by colored roofs near mid
I hope people find this file useful for testing gameplay changes before taking on editing the final map!