I figure that there could be 2 ways Chuklefish could handle this one and they are: 1. Add a feature to the Matter Manipulator that will let you change the shape of the block from a regular square type to a diagonal block type and vice versa. 2. Just add the additional crafting ability with diagonal block type to the regular square block type so you can craft either one that you wish. The Elithian Race mod does this one and the example would be Elithian Glass (they give you the additional option to craft it diagonal like the Hull Panel. I personally like both ways to update the way blocks work but i think option 2 would be the better way to go (mainly because i think it would be easier to incorporate into the main game).