Triangle Foundation, ceilings and stuff

hi there
as it would be a great addition, i tried to create triangle foundation, ceilings and so on.

here is an example from another game:
Building with triangles

i had big issues with snapping.
sometimes the quadratic ceilings fitted, sometimes the triangled ones. but i’m pretty shure we need a seperate snap type in order to make this work.

is it possible to establish a new snap type class for triangled stuff?

do we need dev-input for that?