The following is a typical tree of drawings that we would expect to
have been completed at a CDR level review.  This level of detail will
allow the reviewers to understand the state of design of each
subsystem, and will allow them to see if there are any holes in the
design.  Note that each drawing below may consist of as many sheets as
is needed to expose the design, and they do not have to be completely
finished and cast in stone, but should not be conceptual sketches,
either.  They should be a workable design.  

Penn Array Receiver Assembly
  Bill of Materials
  Receiver block diagram
  Receiver schematic diagram
  Dewar Assembly
      Bill of Materials
      Top Plate
      Bottom plate
      Radiation shields
      Etc.
  Shielded Electronics Rack Assembly
      Bill of Materials
      Shielded Rack mechanical design
      Shielded Rack equipment layout
      Shielded Rack schematic diagram 
      Interconnecting cables
        GPIB cables
        serial cables
        etc.
      Custom board/Box #1
        Bill of materials
        Block diagram
        Schematics
        Board artwork
      Custom board/box #2
        Bill of materials
        Block diagram
        Schematics
        Board artwork
  Computer Assembly
      Bill of Material
      Block Diagram
      Assembly Drawing
  Interconnecting Cables
      Dewar to shielded rack
      Shielded rack to computer
      Fridge to power supply
      Etc.