Canyon ambush with a ceiling and dead ends basically.
Also, a 4v4 version with extra paths open up to a multi-layer system. Every ship spawns at a different height initially, so making your way to your allies is fraught with peril as you navigate the system hoping the next ship you see is an ally, not an enemy. Vertical holes where you might see part of an enemy ship slip by, with some holes large enough to rise through. Some paths that curve about allowing you access between levels.
Maybe I just want a giant cave system to explore (at max speed of course). I've found some crazy spots in maps, but something like this would offer whole new opportunities.
Maybe make the caves an actual hideout base for bandits or something and make fake walls. There are already objects with no collision, so you can fly through them (like CP balloons). Make some routes that look like dead ends but actually open up into other caverns so you can lay even better ambushes.
Then stick a CP balloon on the map and have it fly a path through the caves and call it king of the convoy, like a moving capture point. (shameless self promotion there)
