Here's a picture of a Brend I have you can get from Les for $750:
You've asked twice for "technical specifics unique to his knife." In terms of materials, he doesn't use much that is that unusual. In this case, the blade steel is CPM 440V, the handle scales are black Micarta, and the guard is stainless steel (I assume 416, but that's purely conjecture). These are conventional, almost conservative choices.
There are plenty of custom makers who could make a knife to the same specifications for a half to a third the price. So what are you paying for? What is it that Brend has put into his knives on a consistent basis that have earned them such a premium? The three factors that seem obvious to me are his design skills, fit and finish, and his grinds. For design details on the Eliminator dagger above, I would point to two things off the top of my head - the width of the blade relative to it's length and thickness, that make it a very good thrusting knife, and the addition of a skull crusher on the bottom. These are both functional and cool. The fit and finish is great (e.g. the details of how the blade meets the guard). The aspects of his grinding that stand out are the difficulty of the curves he grinds, combined with the symmetry of those grinds as they are repeated in all four locations on the blade.
If you wanted a really good custom double-edged knife for less money, I'd go with a Bob Dozier KM-2FG or a Dan Dennehy Recon Special (my sentimental favorite). If you wanted a more premium brand for a stock-removal fixed blade tactical knife, I'm not sure where you'd go. You'd probably have to go with a forged knife, or move towards a Loveless or S.R. Johnson boot knife.
Les knows a gazillion times more about this sort of thing, so whatever he says trumps anything I have to add.
