@ purrin:
I thot Craig was going to let this amp ship with the internal flyback transformer and wall wort, and the external ±24 Vdc PS to be a later upgrade option. However, it may well be best to let it show off its best potential right out of the chute, as you say, considering its current competition. I for one am an advocate for the external PS option being available from EC for the BW, rather than a DIY project in the near term.
Considering the price differential between PS options: dual regulated SS PS < battery packs < Hg rectifier tubes, you may want to consider offering multiple options, depending on buyer preference and pocketbook. I know that you lean towards a tube solution, which is the most expensive. I would rather see the multiple PS options available than compromises in design to make a particular configuration carrying discernable advantages more affordable to the masses. The amp with wall wort is already a 'budject' offering. The external PS upgrade at whatever cost is to bring the amp to its full potential for more upscale preformance in line with comparable products at a higher price point.
