looks good, after it seems smoothe, spay some primer on it, it really lets you see your progress, then after the primer dries full, do some sanding and spot putty(bondo) and you should be pretty close...
Here is my current project, its for a e46 (3 series). I recessed the screen to block sun, and to be able to fit a dvd-rom...
http://www.mp3car.com/vbulletin/fabrication/48614-e46-bmw-tft-dvd-dash.html
keep it up, show us some more pictures after you get further.