Can u anwser these riddles??
The answer to your question is not so simple31 feet of unsupported, unbraced beam length is quite a lotHow do you intend to brace between the beams to keep them from twisting under load, particularly at the free ends? I think that you should find a structural consulting engineer in your local yellow pages and hire him to design this cantilevered base for youIt will not be that expensive.
1It was daytime2Neither, 9+5143He's dead4A crane5Either tulips (like Saint said before me), or irises;)