I'm looking at the door drawings in your FSM, page BR-12, and the 99Q looks very similar to the G50 (90-96) Q45. With that said you can get to the 2 bolts holding the window in place but just haven't used the right tools yet. I've done it in a salvage yard so you'll be able to get to those 2 pesky bolts in your driveway. IIRC, with the window up I couldn't fit a socket up there but was able to fit my paws in with a 12mm ratcheting wrench and get the bolts out. Another suggestion would be to remove the 4 bolts holding the vertical sliding bar to the door and everything should drop a couple of inches to a wider part of the door.
You're probably already bloodied on your forearms from reaching into the door so it's too late to say wear long sleeves for this job.
Welcome to NICO!!!
http://www.nicoclub.com/FSM/Q45/1999_Q45/1999_Q45/