[plt-scheme] web-server reconfiguration

I'm just starting with the PLT web server.  So far, it looks great.  I 
would like an arrangement like this:

A place for all the standard things that come with PLT, things that get 
(re)installed with every fresh version of PLT:
     $PLTHOME/collects/web-server

A place for my files that I don't want overwritten and don't want to 
have to relocate on every version upgrade:
     e.g., /any/old/path/web-server

In that latter place, I'd want to put my web-root:
     e.g., conf/  htdocs/  log  passwords  servlets/

What's the cleanest way of doing this (or something similar)?  I looked 
at the docs, but I don't see a way to specify directories, only 
filenames.

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk