Cool build Lofty.  What's the travel/opening of the vise?  Unfortunatelly I could probably buy 10 Fe$tool items for the cost of that hardware here in Australia.  Just browsing the internet for one saved me the purchase for the 'peckers tool.

The "mm" is a neat finish.  Have you considered making a routing template for it? FAIW, distance inhibits, but a local laser service could make a perfect/smooth template.

 I may change the material down the road. Not fond of the dark streaks after the finish. 
You'll need a good parting tool for that exercise.

If your first cut is too short... Take the second cut from the longer end... LBD