As you're doing a left-handed build, the first question is:
Are you used to right-hand style controls, turning clockwise to 10, or left-hand style controls turning counter-clockwise to 10?

Right-hand style: 500K log volume and two 250K log tone
Left-hand style: 500K rev log and two 250K rev log (reverse logarithmic/audio taper)

CTS, Alpha or Bournes, usually 24mm but 16mm may be safer to fit the cavity as you've already applied the finish/paint.