Is there a maximum to the number of Classes you can have in a DLL project?

There are limitations in VB, like to total number of controls
per form or the total number of declarations per module or per
project, but I do not remember any restrictions on the number of
modules per project. But the more classes you add and more your
project can hit any of the generic limitation. Look for "Project
limitation" in the VB6 documentation in MSDN

Marco