BAC1967
Subscriber
There's two screws that hold the metal film housing in place. Once you remove the two screws you will have access to the lens. Just flip it and put it back together. There are tutorials with pictures that will help.
https://www.lomography.com/magazine...phic-techniques-with-americas-favorite-camera
http://filmphotographyproject.com/content/features/2012/06/lens-flip-fun-kodak-brownie-hawkeye
He has inspired you though!