I managed to feed matplotlib into svn-buildpackage.
svn-inject -o loaded it into the archive
svn-update worked though it took a try or two for it
to create all the directories that it wanted.
svn-buildpackage works reasonably well.
After svn-update I fixed the changelog a little and
then was able to build the package.
lintian complaining about several things.
- installing \*.pyc files
- copyright
- dependencies
- description
However I managed to fix all of them
Next question should I store the tarball in svn and if so where?