Hi (any GH shark 
I manage to make a definition in grasshopper to input any set og breps (multiple Brep that can be a building) then convert it into a flat make 2D output to represent an oblique cavalier projection 60° - 120° see the picture) , that we use sometimes in architecture study.
the issue that it should give an output that can maintain the actual dimension of the original model or change the dimension in X or Y or Z as the user wish.
but I can see it’s close to the true dimension but not precise enough
Axonometri _ SHA 60 degree one point 3.gh (1.3 MB)