This one will be based on the DM 600 kit with a few donations from the Mack R Model kit. Decals from modeltruckin.com.
Here is the inspiration truck:
IMG_8544 by Brian Smith, on Flickr
The first order of business is to correct the hood and cab:
IMG_2382 by Brian Smith, on Flickr
IMG_2463 by Brian Smith, on Flickr
Shorten the frame:
IMG_2380 by Brian Smith, on Flickr
IMG_2468 by Brian Smith, on Flickr
IMG_2465 by Brian Smith, on Flickr