Hey camo- sounds good to me (you getting into 1/16 haha maybe not so much the 1/2 guitar ) ...hmm well unless you were doing a 1/2 Hummer and MC over here was going to put a motor into his 1/48 bird...
As far as tips go, you can probably tell me more about which colors to use- but I found this little cartoon "side by side" to be helpful (although I have no idea how that female got her hair so long and didn't manage to pick up a long rife as every Marine is a rifleman first...)
http://upload.wikimedia.org/wikipedia/commons/7/72/MARPAT_combat.jpg
You'll notice that from this "stand off" scale, one big difference in the desert MARPAT from the woodland is the desert is much more a solid color, and the one thing that really stands out are the little brown digi pieces. It's also much less "pattern" than the woodland, which almost has some tiger stripe thing going on similar to MC's ACU OIF guy.
Other than that haha all I really have for you is use a tiny brush and be prepared to go over it a few times with the base coat to keep the brown spots under control.
Here're a few more links (hope they last long enough- just google MARPAT or MARPAT desert)
http://www.freewebs.com/blacksnakekiller/MARPAT%5B1%5D.jpg
http://www.apartmenttherapy.com/ny/look/look-digital-camouflage-027911 (don't bother on the article it made me giggle a bit- pictures are good)