Very interesting, will have to give that a watch.
I have three of the Cobi subs, U-48, ORP ORZEŁ, and the SS-306. However, these are all small compared to that massive 6200 piece monster.
I found a JMBrickland non-specific nuclear submarine to try, which should be here on Friday,
https://www.amazon.com/dp/B0BYRW1PPV...roduct_details.
Figured if I don't like it, I could use the pieces in a scratch build later.
Please post pictures of your progress!