Fighters dock through upper or lower airlocks, for capital ships there is just one docking point on the upper side. When you come out of jumpgate go to the rightmost interior ring turret (four turrets protecting the airlock), the docking point should be straight above it. That hardpoint for capital ships was added in a few hours before the mod public release, and since I was doing testing primarily on fighters I have simply forgot to make capital ship docking point on Ravine. There was no intention to make it difficult, it's just a rough quick fix.