What is the size of a module?

[Frank Benoit]

I want to get an understanding what can make DWT executables smaller and 
if the modules count is really relevant for it.

So the question... A given amount of classes/interfaces etc exist. Now a 
design decision should be made how this code shall be structured into 
modules and packages.

What exactly are the costs for moving code into a new module?
What does affect the resulting binary size?
  - length of typenames
  - count of import that the new module has
  - count of modules that import the new module
  - static this entry in the module
  - ?