Sounds like a choilless SS4. What was the grind on the Scrapper 4?
SS4s were saber ground.
I understand the desire for thinner blades, but there are two issues that I think limit how thinn they'll go:
1) Bussekin Companies, including Scrap Yard, won't disclose how much of their business is military, but I've always assumed that military contracts are a fairly significant portion. That side of their business will dictate specific design requirements.
2) A big draw for Busse Combat, Swamp Rat, and Scrap Yard is their reputation for reliability and no questions asked warranty on hard-use knives. All else being equal, thicker blades hold up better under extreme conditions.