Great little knife and review. I love these type of little knives and I have a few of them. I do my handle almost the same way as you do, but I have found that the blade rocks way more than I am comfortable with.
Here is what I do to stop the rocking completely and secure the blade between the handles.
At home, I take two small screw eyes and screw them into a 2x4 or what have you, and them clamp the 2x4 in a vise.
I them heat the screw eyes with a propane torch and bend the eye straight and then hammer it flat onto the 2x4. When it's done it will look like an allen wrench with the thread part being the shorter end of the wrench. I will also use a flat tip screwdriver and put it up under the section I am hammering straight, just to help make the long end as straight and flat as possible and not being hammered into the 2x4.
Cool it off and unscrew them from the 2x4.
Now when I have a piece of wood for a handle like you did, I screw the flattened screw eye through the hole in the handle and it lays flat against the blade. Do that in two holes and then secure the handles with 550 like you did and the blade will never come free.
I use small and I mean small eye screws so I don't split the wood. The screw eye does not have to fit the hole perfectly in fact smaller is better, but make sure you get 1/4'' of threads into the wood to hold it well.
I also will take and have one screw eye screwed into one handle, and the other screwed into the other handle. Just place the one facing out, in the handle of the knife before you really tighten down the first piece of wood. Then just push the other handle onto the screw and turn the handle until both are now tight against the blade. Make sense? This way you do not have both screws going into the same side of the handle. It's not rocket surgery.
I always have two small screw eyes bent to fit each of my PSK's and they are always with it.
Here are the screw eye's I was talking about.
http://www.stanleyhardware.com/default.asp?TYPE=CATEGORY&CATEGORY=HDW+SMALL+SCREW+EYE
