Hi If you're going to all that trouble, get Keith to send you a new rear battery box and if you need them side panels. They will save you a ton of work and the rear panel as a bit higher to fit the more common taller GC Batteries. Geof Thompson A-60,A-90,C-145x2,ER-36,E-8,E-10x2,E12M,E12,E15x2,E-20x2,E-141X2,C-185