[Crex]

Nice. Great advice above on safety as well. I see you made it so it will swivel at the base, so if you can make it a habit, practice swiveling the blade back over the bench when you stop - for any reason. I made mine to clamp in my swivel vise or any other of my bigger vises. Finally got in the habit of removing and setting aside if I plan to leave the immediate area (took a few near misses as mentioned above to get the message). Experience is a good teacher, but not always the most fun. Might could paint it bright yellow or orange for a visual reminder - grey is kind of "camo" in a knife shop.
I did pad my jaws with sole leather for a little more secure grip. Doesn't mare the blade and can be changed out without reshaping the wood when needed. Like the big knobs on yours, seen too many homemades that require a wrench or allen to tighten or release. Those tools like to sneak off and hide under things.