I have spent today constructing my own bondage stocks. Starting from a plank of wood, I have simply cut appropriate holes for wrists, ankles and neck, then cut it in half, so it can be clamped around my Submissive partner. Most of my time was spent experimenting on the sizes of holes, prototyping how the two halves will fasten together securely and sanding down the finished item to give a nice smooth finish.
The stocks are not quite finished yet, but when they are, I will publish a detailed howto guide on this site, so you may build you own.
Below is a sneak preview of the final stocks so far.
The full howto guide for this bondage stocks project can be found here.