Wanting to progress this a little, while sorting out the finish on the body (which I think is clean enough, just need to wait a week before giving it a polish, no cut); I decided to install the machine heads.

In hindsight I would have aligned them like the left picture, but I had already pre-drilled the holes for the machine head screws back when I thought I wanted the keys to all be parallel.
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So what I've got is the picture on the right. Something to remember when working on the IB-6S.