Well, as someone who's built a set of stocks, I can tell you that really it's a lot easier than you think -- you just have to decide if they're going to be standalone or if you plan on hitching them to something. If you're going to tie them or hook them to some sort of bed or table, then it's a lot easier than if they have to stand on their own.
I went to the local Home Depot a couple of summers ago, and bought a ten-foot length of 2x6, and had them cut it in half (I did the final measurement and cutting later, as I had to fit it to the footboard of my bed, which has posts that stick up about fourteen inches above the bed). I also picked up a about four mini-cleats and a box of eye-loop hooks.
At home, I measured ankle holes with a protractor (I can't remember the size I picked) and did two half circles on each one corresponding with the half circles that would be on the opposite stock. Couple minutes with a jigsaw and I had some holes. If I knew then what I know now, I would've taken a mini-sander and rounded off the edges of the wood inside the ankle-holes -- I want my victims to be in discomfort, but only from the sensations on the bottoms of their feet, not their ankles.
Upholstering the holes was the biggest pain, and the end product was the part I am least happy with. I found a store that sells foam and pillow padding, bought some of each; went to a fabric store and bought a few yards of black velvety-type fabric and some upholstery nails, and then when I got home I cut the foam so it fit inside the holes and then put small pieces of the fabric over them and used the upholstery nails to tack them into place. Later on, I had to take a staple gun and tack the fabric down tighter in places, as the nails were getting pulled out from all the "activity," so to speak.
The last was attaching the cleats and the eye-loops for the string/twine/cording, and drilling a few holes on the ends for rope to go through to hitch the stocks to the bed. Oh -- and there are two latches on the side of the stocks facing the victim -- the kind where the latch flips over and then the hasp twists to lock the latch shut. 🙂 This keeps the ankle holes properly lined up and makes sure the victim knows they're not going anywhere for a while.
The rest of the fabric I use to wrap the stocks in when it's stored or when I take it someplace. For instance, I was invited by a former victim to her BDSM club in Washington, DC and I took it down with me. Let's just say I had quite the audience once I hooked it to a bondage sling and convinced my first victim to get in. 😀
Here's a couple of pics that I hope give you an idea....
knismo