Hmm.. so I think I've goofed. I have the truss rod upside down.

I can route down the 'step' at the adjustment end, but that's how I was envisioning it would be retained in the slot once the fret board goes on. Am I missing something?

If you look in the 3rd pic down you can see the step I included.

I might have to glue in a 'stop' at the adjustment end I think, to make it a reverse of what I have here... does that seem right?