Well sad to say I received my Nautilus and it's going straight back. I thought the quality was just awful on mine. The salon domes were fitted unequally, so that one was bulging out far more than the other, the tail fin was ridiculously twisted and warped - a good 10 degrees out of true with the hull - and the raker arch piece didn't fit at all - it was completely the wrong shape!
Maybe if you had somebody like Nautilus Drydocks available to work on the sub they could fix these issues (though even he would struggle with that badly twisted tail) but out of the box this is really badly made, and not worth the price. At least to judge by this example - others may be luckier.
The search for a decent Nautilus replica continues...