I just read the comments on the laminated/acoustic glass in our GX's. The comment about the laminated glass in our GX 550 is found in the Owner's Manual, page 508 is true - and a Laminated/acoustic glass cutting tool can be found online, and a couple of videos demonstrating the cutting tool, at around $900. Everything I found says a "pointed" hammer will not break the laminated glass, so I'm sure trying to "kick" the glass and break/knock it out isn't going to work either.
So, you better think twice before you go "wading" in your GX!
So, you better think twice before you go "wading" in your GX!