I may be mad, but I’ve had a bit of a thought for a GD2010 project – a scratch build Thunderhawk Gunship. Although you can actually purchase a Forgeworld model and GW have produced a metal one in the past (yes I remember that one – it came in a velvet lined oak box), it is still a fantastically impressive piece. I’d likely make it in some kind of diorama carrying some vehicles or dropping off troops.
One of the really nice things about what is in essence a Space Marine vehicle is that it doesn’t need billions of rivets like a Imperial Guard vehicle would. Although it would be a large project, the most complicated pieces are the two jet engines. All of the weapons can be purchased from existing plastic kits.
Useful Links
http://www.grafstar.com/wh40k/resources.html – Contains some very rough plans (useful for scale)
http://www.ironhands.com/thawk.htm – A 2001 home grown one, using various plastic toys