If you are going to all the trouble of hull modifications, new sails and code 0...you would be better off building new hulls. Look at the latest designs...the hull rocker is completely different from the hobie 14...the hulls have more volume, the volume is lower in the hulls, the cross section is not a "V" shape as with the Hobie...Can you do what you propose? Shure...will it be worth the time and money...no Its one of those cases of just because you can doesn't mean you should.
If he wants to keep the Hobie 14 he ought to just keep it as original and enjoy it for the pitch pole machine it is.