Happiness
Here's your pictures for you. Next time reduce the size to 640X480 pixels then send them to photobucket [img]/images/graemlins/laugh.gif[/img]
I would replace the tank floor with a new glassed in piece. New tank sized to the maximum (I think 70 gal fits in the 20 footer?) Replace all fuel and vent lines, prime and coat the tank (epoxy or cold tar) and foam in place. You can use a piece of PVC board or teak wood in the space between the stringers and the welded pad eyes on the tank.
Do it right the first time and Good Luck !!
