I've haven't seen the Frelon IX in quite a while due to the download link being truncated before the end of archive since July of 2013.
I to was casting around for this one. The vessel still exists, but it is not in any of the regular download facilities.
The addon file you are looking for is: T3G_Tutorial_Vol_Vers_Phobos.zip
This is Dan's update to Trevor Johns' T3G tutorial. The pdf is in French, but the Frelon files accompany the pdf. Sorry, I don't have the link at hand, but a search of DanSteph's forums should locate it for you.
Cheers