Looks good. I don't think 40 oz. will be enough fuel. Of course it depends on how long you want to fly and how easy you are on the throttle. I have a 64 oz. tank in my Ram 500 Enforcer (see attached). That's enough fuel for a 7 minute flight with about 2 minutes of reserve, in case you have to wait to land or go around again.

Great project. Keep us informed of your progress.

Joe