As you are doing a custom build you'll be of course buying custom pots. The info below should help you decide which ones.
Sizes
- Encoder knob base diameter: 18.5mm
- Fatty knob base diameter: 18.5mm
- Super knob base diameter: 14.2 mm
- Faders: 22mm long x 12mm wide x 14.25mm tall
- Knobs fit on 6.5mm D shaft pots.