oh wow...that is sad it ended up in that condition. are you trying to restore it or make something custom? what does the rest of the bike look like? do you have a set of the tank decals?
as far as powdercoating..i'd do a seach on the interwebs and see what come up..also a motorcycle shop might do it all...bang the dents out, clean the tank and powdercoat it for you...same with the wheels.