They're all nice and I'll probably buy whatever's made, but I don't feel the need need a knife sized between an S6 and a DogFather. Of the four, I'd probably rate them (from most to least favored):
1) The Scrapper 7 Prototype (it's the most "stabby")
2) The ScrapWeiler Concept (SY doesn't have a drop-point, and I didn't like the ChopWeiler handles -- I held one at the last Knob Creek and it wasn't comfortable to me).
3) The Tali-Whacker (the saber grind makes it more suitable to batoning).
4) The Camp Tramp (the blade seems wide and chopper-like, but I don't see it outperforming a DogFather, and I already have that).