I know that you really want to use the space shuttle engines,, but I think it would look better with just the nose cones for engines (replace the 3main shuttle engines with 3 nose cones) ..... Just a thought ::)
Hey... I may have a set of 3 1/144 scale shuttle bells if you want them....shoot me an E-mail @ [email protected] and I'll snail mail them to you. Just pay for the shipping.
Looking at the Original U-Boat picture.... I was thinking one( or 20) large Bell(s) where the Rudder would be. Or a large enough cut on either side of the back slope for 2 engines.
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Dude.... You have a great idea. I have been thinking about doing something similar. I just can't get it on paper..... good luck and I can't wait to see How it comes out. ;)