Now that tranforms can be on the Z-axis, reporting minZ of the bounds in scene would be nice.  For example, after a node named frontFace has been rotated on x, y, and z axes, the following expression returns a non-zero value:

frontFace.localToScene(frontFace.boundsInLocal).minX

But, this expression always returns zero:
frontFace.localToScene(frontFace.boundsInLocal).minZ

I'm particularly interested in minZ, as knowing that will allow me to calculate the proper Z-order of placing nodes in a container.  Attached is a screen shot of what I'm trying to accomplish, rotating on all three axes, etc.

Thanks,
Jim Weaver