To all who replied: Thanks so much for all your help and information!
Snapguy : yes, it's an electro gs rangefinder, I'll check out the listing and see what the deal is. Can't hurt
ambaker : yes, i'm in DE, so anything in the continental US shouldn't kill me shipping wise, Once I get the door, I'll find the newer battery and adaptor too.
Chris : Awesome! thanks for the link, I'll e-mail Mark and see if he can help. - however it seems I have more issues than just the missing battery door, the shutter seems to be stuck too. :-/
When I told my wife I was having some issues with it, she said "At least it looks pretty" so... if it's toast, I guess I gained a cool looking rangefinder ornament. - although I'm hoping it can be saved!
Once again, Thanks All