Hello Mr. Sternbach, if you're reading this... I know that you built the Mars Defense Perimeter ship seen in "BoBW" from a Typhoon-class submarine kit and two smaller-scale Los Angeles-class subs for the nacelles. My question is, what was the piece used for the nacelle pylons and dorsal structure? I'm thinking of building a replica of the ship, but I haven't got a clue what you used. Thanks for any info you can provide.