That is amazing information. It never dawned on me that the NC and lower slotted tube are the same that comes with the Leviathan. I'm going to download the instructions for the Big Daddy and Leviathan and compare part numbers. I'll check online to see if I can find a Big Daddy for sale. I didn't realize it was discontinued. I wonder why. It seems like a great kit. BTW thanks for all you help.
I'm almost there. Over the weekend I ordered the NC and CRs from BMS. Their pricing is very reasonable. I got a big piece of 1/8 birchwood at Michales for $2.69 thanks to a 40% off coupon. Once I get the fins cut out I am ready to start building. The boys got me an Estes Sahara Pro Series II builder kit for fathers day. That build has priority over the Leviathan.