Love the GT, love the 147 in front even more. :P
I can't wait to see how you'll fit the tab in the dash. I think Galaxy Tab 7 is one of the few car PC worthy tablets that might be able to fit to the space where the radio and drawers were without much effort.
A friend of mine wants to follow a similar approach at his 147, so I'll keep an eye to this thread and wait for updates.