I think the best way to take advantage of the 3/4 view 3D model/map is when I'm completed, to create a standard aerial view map of the same complex, one that is useable in a standard battlemap format with a grid (and without for VTT usage.)

This way the 3/4 view becomes more of a player's illustration than the only map available.

Of course, this makes it twice the work, but oh well...