Back when I had no idea of how maps in Source work, I was enthralled by how players in the 3D skybox get projected to OMGhuge proportions. Wouldn't it be fun (and unproductive) to see players scavenge around an actual representation of the map at ant size?
Maybe either the key area or the appropriate team's spawn should be disconnected from the rest of the map through teleporters. How about a map where Red has to defend multiple points, which they can only reach with teleporters? The live maquette would help them in deciding which one to take.
I think the table or whatever should have the midpoint of its surface at the map origin for easy developing, while the sky_camera is at the central point of the play area, preferably under a displacement so that it doesn't get lodged in solid. The scale should be 0.0625, if that's possible.
Of course, it had better not be detailed to excess, seeing as the whole map gets rendered at all times.