I wasn't suggesting that we use the Infinity Engine (although if we *could* do that it would make this project a lot easier). If we are to make such a tribute game, everything must be created by us from scratch, in order not to get in trouble over copyright. The only thing that will connect this fan-made game to the BG series will be the name, story, locations and so on. Think of it as a giant fan fiction/mod/free advertisement. At least thats how the fans of the Might and Magic series got away with making a M&M game. Although, since nobody will ever again use the Infinity Engine (since the majority of todays gamers view it as dated and obsolete and NOT 3D OMG WTF WHINE WHINE WHINE) it would be great if it were released from copyright and given away as open source.... Ah to dream..
Anyway IE is the best engine for a BG game as far as i'm concerned, so the fan-made engine should aim for a strong resemblance..