Quote Originally Posted by m_c View Post
Fixtures for boxes should be relatively easy, and reasonably universal.

The hardest part will be coming up with some form of clamping strategy to give good support. If it was me and I was planning on doing lots, I'd be looking at some form of large open vice like setup, which allows the box to be stood on end/edge, and clamped on what would be the top/bottom (or front/back depending on if you class the lid as top or front).
Add in an end stop for locating the box against prior to tightening, and you've got a repeatable clamping setup.
A two piece machine vice can offer a lot of flexibility with infinite variability in jaw spacing and the option to mount on riser blocks,

- Nick