https://steamcommunity.com/sharedfiles/filedetails/?id=1840131242 GK SSA II
A standard sky artillery using better future active single axis gyro which is cheap enough to be built in campaign mode for most of you. (647 k BB)
You can hold it whatever altitude you want and suitable angel to shoot enemy at a long safe distance.(Make sure you set the draw distance at MAX)
W/S to pitch and adjust shooting range.
A/D to turn.
Shift to move forward and Ctrl to speed up.