OH GOD YES!!!!!!!
ok, now that the nerdgasm is over...
My opinion is that this game modded by a bunch of semi-pro's to look like BFG would probably be about as fun as this game modded to look like star trek or battlestar galactica. It would just be freaking cosmetic.
no... just no... If you've played BFG before you'd know that a lot of the elements are very different from sins or any of the others. For example, the Eldar use solar sails, so their movement is very dependent on their orientation in regards to the sun, and they really make for some interesting decisions, since they allow for a cunning admiral to execute hit and run tactics with near impunity if he can keep the sun at his back. BFG makes much greater use of maneuver than the other mods, which adds an entirely different variety of tactics. Also, I have limitless nostalgia for the day I conned my warhammer club into playing BFG. It was awesome even though I had to use my 40k minis for proxies (the emperor's champion made a sweet void dragon or whatever the eldar battleship is called, though). It's kind of funny, but I really learned to play 40k eldar by playing their BFG brethren. If the message wasn't clear enough already... ELDAR PLEASE!!!
I think that a properly executed mod that places the proper emphasis on range and maneuver would be brilliant, and will definitely make the combat more fun (probably to the detriment of the empire as a whole, but I can live with that). I'd offer my services, but right now I have no useful skills for modding. Maybe when I finish a few more cs courses I'll be able to help out...
Also, even though I saved and printed the rulebook with all supplements, I still remember the link to the whole rulebook. I don't know about the urls above, but I'm too lazy to copy and paste, so
Here's the links to all the sections of the rulebook in PDF form