Thanks. I am really glad I went with the gib strip idea. A couple of days after making this I went to try it out for fit with the shim for the router base, the guide was too tight on the track and needed a bit of adjustment. So in just a few days the moisture content in the wood had changed enough to make a difference. Having made this in winter, I bet in summer it would be unusable without the adjustment feature.

As to the hole spacing. If I were to drill my festool track I would make myself an indexing jig on the drill press. I don't think having the holes at a perfect 32mm is too critical but the spacing in between each hole is important as you need both sides to line up. I reckon if you drilled two holes in a piece of scrap fixed to the drill press table, and then used a pin to index it, very similar to your recent shelf pin jig in fact, then you could get very consistent spacing.