Seems you could just side-step SF directly in this case and contact one of their mirrors:

http://sourceforge.net/p/forge/documentation/Join%20as%20a%2...

http://sourceforge.net/p/forge/documentation/Mirrors/

I bet at least one techie working at one of those organisations would lend a sympathetic ear to the effort, if you could find them

edit: running 'rsync -r' on a local mirror shows 512,000 directories from a..ju, but only 43k files. Mirroring all the downloads should be easy