Hull edges.

[Giegue]

Currently there is no way to connect together 3 sides and the corner pieces have that one square edge that mean you cannot properly finish the end of tubes in this game.

So how about a half square triangle based pyramid shape for all the hulls? this would allow for much smoother looking ships.

 

[Riftmaster]

Personally, I find that I need a block like this on occasion (using a lego block I looked up as illustration)

 

[Jolkanin]

...and someone on that thread suggested that block orientation and corner blocks should work akin to Minecraft, where it automatically detects the orientation and type of blocks adjacent to it to adapt and form seamless corners or ramps.