Thanks Adrian, Bitsa sounds more appropriate than Post Industry Thoroughbred. I've got a pic of the tinware but cant access at the moment. The tank Ive got is in good condition so it's the tank I'll be using. I can stick the Indian stickers on and it'll look fine.
Andreas, the gearbox is something I havent looked at closely yet but I think it's odd. It has a 5 spline shaft which I know is not correct because I have watched Michaels vids (like over and over - they are great) AND, i cant change gears on this box. Something is wrong with it. I was trying to get the rolling chassis happening first but I might have a go at the gearbox while I'm waiting for parts.
I sent the gearbox serial number to Graham Scarth and he confirmed that gearbox AM46 was from a '59 Chief. I'm more interested now. Forget the wheels, I might go have a closer look at this.