The 737 doesn't even have MLG doors which makes this even more unbelievable. If this is true, the kid probably crawled up in the wing to body fillet panels.

There's the Cuban guy who hugged the DC-10 hyd reservoir & lived to tell about it. I even think the Discovery or History channel did a story about this guy.
http://www.ctv.ca/servlet/ArticleNew...24694379_120//

If you're going to do it, hide in the E&E compartment.