Looks like the two differences are:
1. The lower-back corner on Cliff Hanger has an angled cut.
2. The top of the marquee area on your cab.
- Where is the marquee guide or attachment point for the marquee?
- Where is the top panel?
- I don't see any signs that any brackets, guides, or panels were removed.
Maybe it's a custom cab (mostly) router-copied from a Cliff Hanger.
Scott