Awww. No diagonals. Though I assume you did that because you wanted players to have a bit more flexibility in where exactly the dock is mounted. Other questions:There will be blocks that you have to put down in lines that the docking block will be able to move along. They will be physical blocks, they won't disappear once out of build mode.
I'm assuming the rail control is "activate a rail block to get the docked ship there." Will the rail blocks output high when the ship is at them? Will we be able to activate the rails directly from astronaut mode?
Will rail-docked entities share shields at the cost of not having AI (or even no active weapons?) Just thinking about all the fiddly little docking platforms that'll get wrecked if a drone sneezes in their general direction.
Sven_The_Slayer I think the best way to deal with docking ships with concave bottoms on flat surfaces is to have a docking block on a rod on the mothership or station. The smaller ship comes across and hits an activator which brings up the mount point.