There are many things you should never let anyone but a certified Volvo technician touch, and then there are things you should never let a certified Volvo technician touch.

If there is one thing you should never do, is let anyone but a professional car audio installer, install ANY piece of sound equipment.

I can't really help you with you problem as I own an 850 and I don't want to assume the body panels and interior are similar enough for me to give advice to, but I just want to let as many people know, car audio is for car audio experts.

I have an Alpine 6 disc in my glove box as well. It's been in my car for more then 2 years now, and the install was absolutely perfect. It sits flush against the driver side inner wall of the glove box to make acces from the driver seat easier, and to leave enough space on the passenger side inner wall for storage of small items like sunglasses, pen/pencil, notepad, lock nuts, cell phone, charger, etc. I personally keep a pair of sunglasses, a pen, two pencils, and a note pad with my changer in the glove box. I have no problems with the door not being able to be closed properly, or with loose panels.