More great ideas! I love the big sub with the flat-bottomed hull and shallow (2") draught. Since I'm not in this for ultimate scale realism it would probably be easier to build a flat hull and only worry about what sticks up above the waterline. I'm only concerned about what they'll see above water, anyway!

Way cool!

P.S. what's a "trawl motor"? That's what the post said was used to steer the sub instead of a rudder.