Philip, like EFX said, and the generous linking Fish did, they're pretty much all the same. All the same concepts apply. I don't mean this to sound crude, but if you're not able to extrapolate the information from the other threads and apply to your situation, it might be best to hire someone to do it for you. Working on boats is often a "figure it out as you go" thing - there isn't going to be a "step-by-step with pictures" thing. One thing you might consider, if the tank won't come out whole, is cutting it (take precautions for spark vs fuel vapor, obviously) and then have the new tank built slightly smaller - it'll probably only make a difference of a couple gallons, max.