change the appearance of parts

I would like to talk about the details. In the game you can create incredible craft but there is a problem you are missing a triangular element for example: https://pin.it/3V5x4WR
and the question is how to create a triangular cargo compartment or a triangular fuel tank. Only one thing from the proposal: add the ability to change the shape of elements from a square to a triangle and a hexagon.