Peppe, In lieu of scanning , I took some pictures from my references showing the hanger opening operation and what to look for detailing wise when modeling. These small but crucial hanger details are usually omitted in drawings, illustrations and models. Unlock latches should be in the recessed openings like the one appearing on the two black tower images. I am not sure if the front hangar dome opens to the port or the starboard, or if differed between the boats. It would be very hard to maintain water tight and structural integrity if the doors open bomb bay style from the top as in the computer illustration that you posted above. It just doesn't make much sense to open that way because that would be too impractical and time consuming to use the crane to lift the plane in and out of the hanger when they had track rails below for the plane's dolly in order to launch from the ramp. IMHO, The crane was for retrieval only, and would be used to lift the plane out of the water and on to the dolly which would then be slid back into the hanger so the boat can get underway. Time was very limited and crucial during those tasks of launching and retrieval. At this stage the boat is at it's most vulnerable so the least amount of time needed to perform the plane launch/recovery the better.
Here is an image of the hangar Open for retrieval.
These images show the recess, hangar lock latch and hing bulge.
This image shows how the rails would pivot connecting the ramp to the hangar rails. This illustration is off of a I-400, but this system was perfected by the earlier classes and was scaled up for the I-400 class.
This image shows a cut away of the hangar. It also shows the bulkheads that wrap around the water tight hangar for maximum strength and structural integrity.