Sketchup To Garry's mod project

So the idea of this project was to take models made in sketchup and put them into garrys mod. The thought behind this is that we want to take our 3D creations and insert them in an inhabitable virtual space. In a sense, taking back the game space for creative expression. The major problem with this was that in order to make a 3D model from sketchup, it must be saved as a .vmf, which does not allow for "convex geometries", essentially anything that is not a solid three dimensional volume. This really defeats the purpose of going from sketchup, as the complicated models created in sketchup cannot easily be broken down into hammer (which complies the .vmf into a .bsp file)