I have read where guys will take two equally thick pieces of wood and temporarily stick them together. Trace your lure shape on one side and cut it out, round corners, shape. Now snap apart the two pieces and trace your through wire design on the inside of each piece of wood. Dremel out the channel on each side, lay the wire in and glue the two pieces permanantly together with epoxy. Add weight, sand, and you are done.
I think most of the more experienced "thru-wire" guys have devised a way to drill fun length through the wood blank. They do this in one of two ways:
1. They use a lathe that has a drill bit attached to one side that drills directly through the center of the wood piece every single time, or;
2. Using a drill press. Put a piece of wire slightly longer than your lure in the drill press. Now, secure a wooden base with a nail in it to the drill press table. The nail should line up exactly with the tip of the wire. Now remove the wire, install your drill bit, and put one end of the lure on the nail. Now you can be sure that when you drill down through the wood that it will exit right at the nail...you checked this with the wire.
Once you have a hole through the full length of the bait, you can drill the belly wire holes out. Make a loop in the belly wire pieces and thread the full length piece from nose to tail through the loops and then secure on each end with a loop. Fill all the holes with epoxy. You can learn how to make the loops by doing a search on "striper forums"...striped bass fisherman know how to make these loops.
Or....
3. Use screw eyes, lol.
RM