Pattern holes and flat size

Phenom
Phenom

Can any body direct me to some good patterning tutorials? I need to figure out some simple automation to create the sheet metal flat patterns for drawer packs.

 

It's the holes in the side panels of the drawer packs I'm trying to set up. The flat size also varies. The drawers can come in any mixture of sizes (1" incraments) and the larger drawers are always on the bottom.

 

My first thought is to make a plane for each posible drawer from the previus. by making the spacing of each plane from the first set of holes, I could set up up so that a plane space of 0 just re-create holes that are already there.

 

The depth can also vary. Attached is a photo on the sheet I want to use patterns for,