This is my second (technically third) map, gg_rotadome_v2.
It is derived from another map of mine, gg_rotadome, but v2 has a snipers nest in the middle of the map.

In the dome, there is a circular area in the center, divided by a wall. CT's spawn on one side, T's spawn on the other.
On top of the wall sits a small snipers nest, with a ladder leading to it from both sides of the wall.

A rotating 'conveyor belt' sort-of thing surrounds the spawn areas.
The rotating platform is designed to travel from one spawn area to another, but can be used for drive-bys if you are inclined to do so.