I just finished my first decent car build in ages. It's a 2009 Dodge Viper SRT10 in Lime (I'm a bit of a sucker for this colour!).
Building the doors was horrible. I spent over 8 hours trying to get the right shape and have them open and close. I finally came across a pretty dodgy technique to make it work though, but at the cost of them being 3 studs thick, leaving less space inside. I managed to pull it off though I think. I'm really happy with the build and feel it's one of my best cars.
Pics here on my flickr page (my other cars are there too).
Better description is on my MOCPages:
http://www.mocpages.com/moc.php/349811
Thanks for viewing.
Sam