After a couple of hours here is where I am at so far. The underside of this vehicle is VERY tricky. As i want to model this with the utmost detail, i had to figure it out....wasn't easy.
Nice start! You might want to check some of the overall proportions (ie. the comparative size of the rear grill and overall wingspan), especially given that it sounds like you're going to put lots of effort into this one.
Posts
http://www.modelermagic.com/?p=2405
http://www.modelermagic.com/?p=2580
I'm sure that you're like me - making sure to nail the overall shape and proportions before you start to go nuts with the details.