following the curve of the hull instead of doing a square corner tank, he was able to increase the size and I only lost 4 gallons of fuel capacity. He completed the job on time, on budget and with no damage to the interior of the boat. He specializes in replacing tanks on boats and is on the Grand Banks web site. I guess they have quite a few tank failures do to the location. I can't recommend this guy highly enough. I later had him make me a SS tank to store my rum in. It holds 5 gallons and is located behind my stove in the galley.