The uploaded family is a "front" for a casework family. My goal is to make the apparent number of drawers parametric, so that essentially this front could be used to represent anything from a 4 drawer filing cabinet to an 8 drawer flat file and anything in between. I've been using model lines on the face of a simple extrusion to reduce model load and complexity for all our cabinet fronts. However I'm having trouble properly controlling the extents of the arrayed model lines in this case. With no geometrical contraints I can properly control the number of and spacing of the model lines, the issue is with the model line extents. The version I've uploaded represents my latest attempt where I've litterally created a "model" line family to array, however I'm still running into problems controlling the nested family's location. I started with attempting to just array a simple model line, but had problems there. Maybe I'm making this too complicated (I'm not a big fan of trusting to Revit's sketch dimensions to properly guess at my intent). Anyone got a solution or suggustion?