I have the same tank and have been considering cutting out the filler-flapper assembly... wondering what technique others have used... sawzall and the like
At this time I'm thinking a good tank flushing followed by stuffing a rag inside, inverting the tank and going at the seam with a die grinder.... maybe even running air in at the petcock bungs. I may be the Count of Over-Kill.
I'm concerned about, and want to minimize metal fragments getting in the tank, though I'll be cleaning and prepping it for POR15 afterwards.
I have no intention to make a bomb of this operation.
So, how have others hacked this appendix out?