So to chime in - I purchased two of these kits. One from eBay and there were no issues. I ordered a second one through my local hobby shop, and that kit, too, has no apparent issues. The cab is intact with both. So, maybe you guys got kits from a bad run?
Of course, I don't know what a "run" actually entails.
Anywho, it looks like a fun, and somewhat whimsical, little kit.
Any recommendations for a non-V8 engine?