PCs deploy in the diamond shaped area of the ship that is slightly left of center. Add some extra room horizontally, then have enemies spawn to the right of the ship.

The black areas of the ship are hard cover protrusions. The blue and white lines on the right are soft cover solar panels.

One of my players made this one. I had success with another one of my players making a couple of maps in the past and I figured he could give it a try. There was a debat over which way was the front of the ship. The player who made the map and one other player thought left. Another player and I thought right. The other players couldn't tell. There is only interesting cover on the right side, so it was my final decision that the ship is traveling to the right and that's where the enemies come from. This fight would be trivial if the enemies have to approach and fly 20+ spaces before they could get to cover while the PCs are in cover the entire time, this would be a pretty trivial fight.
