I've started by mocking up the frame and the cab. I ended up having to lengthen the frame by 4 inches to achieve the length I needed, this was kind of unfortunate as I figured by starting with w925 kit that had a sleeper, it would be long enough since my truck is a just a day cab; this was not the case.
Once that was done I started by building up the engine, another reason I got the w925 kit was because of the big inline six Cummins it has, something that would have also been found in my early 50s Pete. The quality of detail on the AMT engine is OK, not anything amazing, but enough to work with if your willing to spend the time scratch building a lot of your own parts. I was expecting a little more seeing as how this kit was reworked before they rereleased it. I ended up dechroming all of the engine parts, in which I found the chrome had hidden some of the details and helped me in the painting process. I still need to go through and build all of the pulleys, accessories, wiring, and tubing on the engine which is going to be long process but well worth it.