i am sure I should come up with a clever story about this but I just tried to close the roof with a fake handle sticking out over the window. Made a nice po when it went.
How easy to replace or do I just call a glass specialist?
Fiddly but not impossible, I would take the door off and place it on a table with a blanket underneath.
Windows are cheap and plentiful, have a look at eBay or the Zed forum