Here's a thread on the Task Force truck's windshield panel, you may be able to adapt the methods to your truck...
http://www.garagejournal.com/forum/showthread.php?t=149532 If reproductions are available, typically they may need some "tweaking" but should give you a good head start. If they are not available, You'll just need to study how the parts go together, what and how to make them, and go from there.
For drip rails, here are three threads I've done drip rail fabrication/repairs on. Again, this should show some of the process where you may be able to adapt to your particular vehicle....
http://www.garagejournal.com/forum/showthread.php?t=86935 http://www.trifive.com/forums/showthread.php?t=16557 http://www.trifive.com/forums/showthread.php?t=33963 ...and here's my shop thread on metalmeet, it shows some various forming methods, including hammer forming...
http://www.metalmeet.com/forum/showthread.php?t=6251
