I started drilling out a Hammond 16x8x2 box (for a 5E3 based on the PPwatt PCB) yesterday, too. Amp building is in the air! I'm using MPS Transformers, so I'll be able to give you guys a good review of a reasonably priced OT and PT.

My biggest question now is whether to use Orange Drops or Mallory 150s. I've got plenty of both.