kinda finny thales made a mod that has light weight aircraft blocks but his have x1 x2 x3 x4 x5 x6 x7 x8 x10 x12 x16 and they have the inv and normal pyramids and even one with a rectangular base. its VERY easy to add and i think thales even mentioned he would be happy even if the devs just grabbed the blocks from his mod and just added them.