Mass Intersection / Unit Aggregation Problem

Hi All,

I am having a problem with a brep / curve intersection operation.  (Please see attached definition)  The goal is to use the core to create a corridor, then create units (floor plates) aggregated along it.  They are always contained within the mass that is generated in the definition.  First, the corridor extends until it hits the mass, then the lines that determine the units extend from the corridor line to the mass.  The mass is generated from a block perimeter then a bunch of voids.

I have it working on a single floor basis.  I can adjust the height of the cut and it works fine.  (It flips in a few places but I am not too worried about that right now)  However, I now need it to operate on every floor at the same time, say at intervals of 10-12 feet per floor. 

My problem occurs at the second brep / curve operation in the definition.  I think it is a data tree problem, but I can't solve it.  Any help would be greatly appreciated. 

Thank you,

Joe