WEM puts out the radar PE set.
For those interested Eduard has the instructions for their PE sets on their site that are larger and better detailed that the ones that come with the sets, I have them printed out in my research binder for quick reference.
The only PE set I don't have since it's post war (WWII) is the deck and siding set, it does have the advantage of having all the air recovery valve plates but like the model has the wrong marker buoys that are the larger post war versions and actually in the wrong place for the boat I am depicting.
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Keep in mind our friend plans to make her as a Museum boat so unless depicting her getting the torps added some years ago he would be better off with civis with cameras on the deck.
For all out museum detail adding the museum mods and safety additions might be a fun exercise in scratch building.
There are pix of Batfish getting a torp installed about a year ago, she is currently in the process of getting the decking replaced so there are a few nice under deck pictures available.
For those building any boat as commissioned you will need to open the doors on the fairwater (as I mentioned thay are only on some of the Museum boats) and remove the broom off the shears (unless you are depicting a boat coming back from combat, then I would replace it with something at actually looks like a broom)
If depicting the boat with the front dive planes down you can add more detail by adding the air flasks behind the openings where the dive planes rest.
Photos below are from the Cod and Pampanito.
Poke a round on Submarine Museums for pictures and information on the boats by the people actually working on them, lot's of good stuff in the forums section.