This example is at the Paso Robles museum, an S2 which landed hard, bent its props, was retired and stripped of useful items like the fire-retardant tank, cockpit instruments, etc. So here it is, and I could duck into it and get some photos from inside, which I did. You can see the open belly where the retardant tank had been mounted, and at the top right corner, the structure of the wing where it carries through the fuselage. 102-0258_IMG
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/9998127@N06">Bill Abbott</a>
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/wbaiv/4311289422/">Grumman S2 Entry door, starboard side, from inside</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:High_Contrast" title="User:High Contrast">High Contrast</a></li></ul>