I decided to use the gas tank to mount some of the electronics, and to keep the existing front mount point for the seat intact. The first step was to remove the fuel pump/filter and the float, then completely empty the gas residue in the tank. I then put a few cups of water and a little liquid soap in there and sloshed it around to make sure no gas was left behind... then to make really sure I put a heat gun on low and ran it into the tank for about 15 minutes to completely dry the tank. A Sawzall then made quick work of cutting the bottom half of the tank off.
I then took a grinder and cut the filler connector off and ground it flat to the top of the tank. This will let me mount the J1772 connector where the fuel inlet used to be. I needed the 1/2 inch of room so that the J1772 would drop low enough for the fuel door to be able to close.