I have had a go at another build, this time with the battery centered, it seems to be a bit quicker and handles well. I was a tad worried about roll over with the battery position but after a trial on the roads and making sharp turns at speed, roll over seems no greater than when the truck was stock.
http://www.youtube.com/watch?v=SElWKYcTicA , I've attached this to save filling up theses pages with photo's.
Merry Christmas to all!