not a great idea
I guess it depends on what you want in a sailboat?? A sailboat that sails reasonably well, or a dodger?? IMHO I would never remove that much sail area on an O'Day (as they are not fleet of foot to begin with and that's alot of sail area to lose) you are raising the boom creating more weight higher on the boat, thus losing some stability. It sounds like the guy who is measuring for the dodger doesn't want to lose the job. This would involve more $$ than having him lower the dodger a few inches. On my 28, the dodger(in the open position) sits just below the boom. On my friend's O'Day 30, it does as well. Unless the boom has been lowered below the original height, change the dodger design, not the boat's design.