Requirement:
6 cm axial direction, 2 cm wide, 500 
m thick
Justification:
Axial dimension corresponds to Si detector length.
Width is minimized to permit sufficient space for IC and passive components
and signal trace routing, while still permitting overlapping of adjacent
ladder assemblies. 500 
m is minimum thickness necessary to prevent
extensive warping and breakage during Hybrid manufacturing. All dimensions
have been minimized to minimize the additional radiation length.