Thanks...for all the quick responses and great information that all of you have sent me on this matter of Buoyancy. To answer all your questions...I did stretch the 10' version of the AUK to 11' 4''......by evenly spacing out the forms...the lines of the boat came out looking great by adding the extra foot or so...I did not mess with any of the width....I appreciate the software, the formula that was sent, and the idea about using the same percentage of boat for the cockpit location...I will use all the info that was sent to make the decision on the cockpit......my belief is that it was such a small stretch is that using the same percentage as to where the 10' cockpit was placed will be adequate for the 11'4" version.........................Thanks again for all your help...................Gordon