Just found this. You can clearly see why the belly and fuselage of the Jug was so portly- that's a lot of plumbing and ductwork to enclose! Great modeling possibility....if you're really crazy! Enjoy!
Mike
https://www.pinterest.com/pin/350366045987114669/?utm_campaign=category_rp&e_t=c2fe5d01206948a7b16466e6ff275a55&utm_content=350366045987114669&utm_source=31&utm_term=2&utm_medium=2012
https://www.pinterest.com/pin/529102656211541476/