Here's an SSN I've been working on for about a week. Feel free to tear it apart.
*Note: The stern torpedo tubes face diagonally out away from the stern, and do not make use of wire guidance to prevent getting the wires tangled in the prop. They're basically for short range use only, when the torpedo can use its own sonar to home in on an enemy sub. If this doesn't sound very plausible, they can be removed.