thanks for all the tips.

I've now got a good idea of what my plan is.
The camera back won't be made of thick wood, so I don't need a drill press. I'm trying to keep it as light and compact as possible because it will be coming with me on a month long trip in Sri Lanka, so with this in mind I'd like to keep the back side and it's mate a similar size, or the back bigger if either has to be.