Regarding the AMT White Freightliner SD: that was the first tractor kit I ever purchased at 10 years old, lol! I gave it my best shot, and got it all the way to the point of getting the cab attached to the frame but it was so fragile it fell apart. Bent, but not broken, the next kit I tackled was the AMT California Hauler and it was a joy to build. Today, I'm still working on a "revenge build" of the SD, and it's going pretty well. Same problems as before, but now I know what I'm doing and I'm turning it into a solid build.