So the problem with calling the knife a custom with a Buck 110 frame is that there are no marks distinguishing it as an authentic Buck 110 frame? As far as I know, the standard Buck 110 frame has no markings at all to distinguish it as authentic Buck.
If, for instance, I took a factory Buck 110, then put a non Buck blade in it, and I told someone (in conversation, not in the context of selling or collecting) that my knife was a customized knife with a Buck 110 frame would that be untrue? I don't see why a knife with a specific part can't be called a knife with a specific part, eg a knife with a Buck 110 frame, if that is what it is.
Thus, I see the problem with labeling the knife in the op as a Buck 110, but I don't see a problem with calling the knife a custom knife with a Buck 110 frame, if that actually is what it is. However, if the problem is just that proof is needed in the context of advertising the knife for sale or collecting, then I agree that the knife shouldn't have the Buck or 110 names associated with it any way.
In other words, I see no problem calling it a custom knife with a Buck 110 frame (if that's true) in conversation, but I see a potential problem with using the Buck or 110 names to advertise the knife for sale purposes.
As far as Jarheadz's knife goes, I see how it could be considered a custom knife with a 110 blade, or a rehandled 110. If his knife is called into question, then that would also call into question all the acrylic/polycarbonate handled 110s that allow you to see the internal workings (very cool knives btw). Would those also be custom knives with 110 handles or just rehandled 110s?
Again, I don't mean for any of my post to sound confrontational or anything. I just find this discussion to be really interesting, kind of like the question of how many parts must be replaced on an item before it can no longer be considered to be the same item any more.
Edit: I can see someone already commented about Jarheadz's knife. I agree, this all seems to be a matter of opinions and opinions vary.