Hi! If you were making it in top down mode (XZ plane), in that case it would be pretty easy, as the camera plugin does support a top down mode, and the grid is already XZ. Then it would be a mater of having your bricks rotated in the editor, then rotated back to XY in the game .
If you want to make the editor working in XY, you have to replace the camera system, because it's not supporting this kind of side mode, then flip the Grid and change his parameters to make it work in XY. That should not be to complicated, and I should definitely offer a side builder mode. I unfortunatly can't work on it now, as I'm overloaded, but if you have some notions with code, you can achieve it pretty easily I believe.
I will add that to my feature request list for now.
Keep me posted,