Originally Posted by RockfordWhite
There was an article in a BYO a year or so ago about a guy who made a 20% beer. Basically he boiled down like 15 gallons to 5 or something crazy like that
Yeah, and his fermentation process was also ridiculously complicated, it was COMPLETELY different than anything you'd do for fermenting a normal-gravity beer. The wort was very thick and almost syrupy, and he wound up fermenting it by canning 4 gallons of wort in quart-sized jars, and adding them one at a time to the fermenter every few days after the previous addition fermented out most of the way. He also used a bunch of beano to help get the FG down.
Because of the incredibly complex process for actually making a beer like that, I doubt you'd really be "cloning" 120 minute IPA per se, but rather making a similar-strength beer that might be in the ballpark.
Personally, I don't think it would be worth it for the beer itself, merely for the 'cool factor' and bragging rights of managing to make a super-high-gravity beer - more of a science experiment than anything.