Advice needed: How to maintain X projects and share them?

[Jari Aalto]

I've used to do development through central server, but the ability to
use changesets is the strength of the distributed systems. Now, I'd
like to see if I can do same with mercurial to maintain following
project structure:

     GroupA
        ProjectA
        ProjectB
        ProjectC
        ProjectD
        ...

     GroupB
        ProjectA
        ProjectB
        ProjectC
        ...

If I changed to mercurial, would I have to separately define read
access through apache to each of these projects? (I have 100+ of
them). Right now a checkout of "GroupA" gets access to all projects
below it when CVS is used. Here the GroupA or B are in fact
directories that "group" the projects below them.

What configuration would be needed to do the same in Mercurical?

Jari