Hi Plain faced,
Sorry to hear of your woes
If you can find my TLA-1R build diary, I documented how to do the wilkinson bridge. Its well worth it and much better than the kit bridge.
I used Gotoh pots as well and had to widen the control cavity because those pots are HUGE!. I used 60 grit sand paper and a lot of patience. Nowadays I'd just use my plunge router.