Seeing as how this thread got bumped back to the top, and since I have re-learned how to post pics, I thought I'd post a pic of the four United boot knives that I mentioned in my previous post (#15), plus one more.
The one on the far left with the longer handle is the first one I bought, and the one I torture-tested. Several years ago I modified it and it became what I call a "hybrid", a knife made from parts of different knives. I wanted a longer, more hand-filling handle, so I used the handle from a SOG Desert Dagger. I had to create an extension for the tang to keep the end of the handle rigid.
The one on the far right is another hybrid. The blade is from a current model of United boot knife, and the handle is from a V-Tech Recon Bowie. The current United boot knives have slightly longer, but thinner blades than the older ones.