Suburban fuel pump access hatch

[1ndatrunk]

Anybody ever cut an access hatch in the floor of their Burb to get to the fuel pump? Seems like it would be better than trying to drop my 3/4 full tank by myself. I'd like to know the exact spot I'd need to cut and depth of the blade or wheel needed as not to chop up any lines. I would prime and treat the edges to prevent rust, and use weather striping and sheet metal to fashion a removable cover to put back over it. I'm hoping it's right under the third row...