I think you'll be right with your measurements. There doesn't look like anything worrying there. I made some minor errors when building my first ST-1. Some I wouldn't have picked until I played the guitar for a while, especially bridge placement. It doesn't make it a bad guitar (for me), I still play it everyday. but I jot these little things down, in a year I'll revisit it and tweak/fix them.
Yeah I used Gotoh's which are very very wide. I needed to widen the rout considerably (I sanded it by hand with 80 grit and it took a few beers to get there). I also needed to widen the control plate holes as the shaft is also wider than the PBG pots. I imagine you'll have to do the same with the Bourns.
One issue i've had with replacing pots with gotoh's and bourns, is that you only get one nut that fits the shaft. as the shaft is quite long, it protrudes too far out of the control plate. The shafts on bourns are imperial and thats not easy to match in OZ (don't know about Canada) So I used a circlip on the shaft to stop the pot from pushing too far out and the nut and washer to hold the control plate onto the pot. If you get a better fix than that, let me know!
Shorting issues usually happen with CLR switches as they are soo big. I had to rout a channel in the bottom of the control cavity so it didn't touch the shielding.
No issues with the orange caps.
Great upgrades!
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