Welcome to the wonderful world of the Gato.
I just recently started mine, USS Bream SS-243 Late War.
Pix are pretty sketchy as to what's in behind the dive planes, there is the actual machinery that moves them and probably some piping on the pressure hull as well as framing.
Blueprints are available from Floating Drydock but it gets confusing and very expensive.
You might be able to find something at the Batfish forum since they have been replacing the wood decking and have posted a few pix if you dig through all the topics.
Have you decided on what boat and what date you are going to build her as, or are you going straight OOB?
No 2 boats where the same and they changed as the war went on.
While the model for the most part depicts a few boats at different stages of their careers there would be differences even in sister ships built at the same time.
The forward torpedo shutters are actually wrong for the Cobia, they should be the flat Balao style.
Some of the things you will have to modify and add are replacing the 2 marker buoys with round ones and probably moving location depending on the boat, than there is adding the exhaust openings along the edges at the rear.
Will you be adding the flood/ballast tank openings on the bottom?
If you are doing a boat form a diffirent yard besides Electric Boat than your limber holes may be different and the anchor well may be on the port side.
Not sure what you mean about the pix.
Are you asking how to post pictures?
If so you will need to open an account with a free on line host like Photobucket.
Once done you hit the upload image button once the window opens look for the file and image you wish to upload and click on it.
Once the image has up loaded move your mouse over the image and a menu will drop down, select the type of link and click on it, next in your post here just right click and paste (with some browsers use Ctrl v).
IMG code will post the image without having to use the little tree icon in the menu above.
Eric...