Cutting the Tank into thirds:
Each side and the center span.
Replacing the center span with flat sheet metal, increasing the width, until sides are in acceptable position for the frame.
"Big Bertha" my KTM 950 SliderMoto with 19/17 spokes, FCR41's, 2-into-1 high pipe, single side front brake and handcut flattrack style tires. Gettin Slideways is good!