GMS 2.3+ Drawing floor and walls in 3D?


Hey all, working on creating a Marty Party-esque game board.
My project started as a top down and I'm trying to achieve an isometric view.
I'm not a spriter so I can't really do the "fake/psuedo" 3D. I'm opting to use GM's actual 3D functions.
Most of my 3D experience lies with GMs 8.1 though and I know GMS changed 3D to use primitives and matrixes instead.

Soo, my question is, how do you draw sprites vertically along the z axis?
I'm trying to achieve this effect. And then for the floor? Do I draw that in a similar manner?