HelloRoy,
The AMT instructions are known for not being very clear. Before starting any vehicle Iike to spend time researching the particular vehicle that I am wanting to build. One of the best sources of reference for any model truck kit is Tim's website (www.timstrucks.com). He recently built the K123 and has some good photo's and information about the build check the page below:
http://public.fotki.com/mackinac359/kenworth-model-gallery-1/kenworth-k123-out-o/
Dave,
Those two trucks look superb, very impressive,