Some general info for anyone interested:
Note that this takes about 2GB to download, since it includes all RE history since commit #1
(quite impressive that it's not more)
If you want to clone from this and then add the git-svn integration you can do (provided you have git-svn set up of course):
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git clone git://supraverse.net/redeclipse-svn.git redeclipse-git
cd redeclipse-git
git svn init https://redeclipse.svn.sourceforge.net/svnroot/redeclipse
git config svn-remote.svn.fetch :refs/remotes/origin/master
Following this, you should be able to use
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git svn rebase
to update directly from sourceforge svn instead of the git mirror (I guess it's better people taxing sourceforge, rather than your mirror, Marenz

You should presumably also be able to commit, as you would with svn, using
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git svn dcommit
since git-svn should pick up existing svn credentials, e.g. in $HOME/.subversion
(Can't confirm, I'm not comitting to RE myself).