The cardstock Nautilus is definitely a very neat model, and a great conversation piece.
I suppose you've got to take into consideration that there are a lot of die-hard Nautilus fans out there willing to shuck the bucks for an ultra accurate version in larger scale.
I've built Sci-Fi's and TI's 31" kits, and both are excellent quality and very close in accuracy to the Disney film. There's nothing quite like being able to look into the wheelhouse and see the wheel where Nemo piloted the Nautilus in his quest for vengeance!
The paper model is a great project, and I am, quite frankly, in awe of your skillsl required to construct the Nautilus completely from paper, but you can't really compare your paper kit to a fully detailed resin one. They are two completely separate entities, appealing to two different kinds of people.
Just my thoughts...
Edited By Bob the Builder on 1059587973