Request for help in modifying ships

[mundio_73a]

Asking for help in modifying ships' equipment

Sorry for my english, the message was translated in google translator.

Attached I am sending a link to the google page with graphic files

https://sites.google.com/view/imbire...C5%82%C3%B3wna

I'd like to change the ship completely.
For this purpose, I chose the KILO (Project 636) and ASTUTE classes.
I note that the subsim mod with AStute does not work. I have a working mod with this ship, but have no idea where I downloaded it from.
I would like to put a 20-37 mm AA cannon on the coming tower in or near the place marked with arrows.
The cannon may not be visible underwater.
I want this cannon to combat airplanes and fishing boats.


Another problem is that I would like to increase the submersion time (oxygen reserve). Unfortunately, I don't know where it is configured.

I am looking for someone to help me with this.

Why do I want to make such changes?
One sentence of explanation: I play for fun - not for reality.


Best wishes,
mundio_73a