My Suggestions

Directories and Installation

• Adopt directory structure compatible with future use of CMT, ie all source in src subdirectory, include files available in package
• Convert small or new packages.
• Leave HDMC until we are sure we (and the rest of ATLAS) are happy with CMT.
• But add make install to HDMC now.

CMT

• Works for single simple package (l1calo/rc).
• Try it on a more complicated one involving code generation and also one with Java (eg for IGUI panels).
• If OK, start using it seriously for coherently building all (new) packages.

Documentation

• Include a doxygen control file (Doxyfile) with each package.
• This will at least extract classes, methods etc
• Encourage addition of suitable comments too!

Namespaces and Naming

• Use l1calo namespace for all new packages.
• Aesthetic or potential practical problems with any scheme. To avoid any future clashes with Online software (and Offline and other detector online software) prefix all our packages and use 2-8 character suffixes, eg L1CaloModServ.
  PS I dont really like this...