FWIW, Chief draws walls from the top of the wall so if you want a truly usable, snapable grid, you have to use a 3D object for your grid lines (molding polylines in the attached example) and place them at the ceiling height of the floor you're drawing on.  I personally never draw walls in 3D though and I'm not sure I ever will.  If you want the clients to see the action in 3D you can always just tile your views. 
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