This photo shows the release lever pulled down but the upper hatch still in place. It think the whole panel over the pilot's head could swing up and open to the right.
http://www.ausairpower.net/AARG/DAP-...328-2012-3.jpg
http://www.skywriters.net/Gallery/beau2.htm
In an emergency, the whole panel would probably release. The pilot would need to stand on his seat to climb out the top of the plane.