Looking good Sean, but I think that you may be right about the tanks.
This is supposed to be the main truck from the movie as it looks today
This is supposed to be the restored short tank truck from the movie.
It does look like that the tanks are not below the air tanks on both, but it also looks like either the tanks sit a little higher, or the battery box may sit a little lower. Regardless of a slight difference in the tanks, when you finish this one, I'm sure it will be a convincing Rubber Duck.