Years ago (pre-2004), the only way to get a bigger screen in your car was modding it with a lilliput or a Xenarc. Even double din units had 5.6" or 6.5". There were no 7" OEM Nav screens pre 2004 IIRC, and a big thing about modding your car was fitting a large screen.
Why stop at 7"? I think the iPad is just the right size.
I don't care for OEM looks anymore, but if I did, I wouldn't mind leaving an iPad in the car permanently. It would be great to hide that large bezel anyway. Why remove it? Just J/b it and sync wirelessly.