DNK, Thanks for the picture! I noticed that your clutch pedal has the "extra tab" on it. In the Moss catalog picture, it's the brake pedal with this tab. Interesting. I'd really like to figure out how the brake pedal return spring was intended to be installed...
Anyway, I think I'll set up my pedal box like yours because this configuration seems to be the best for lining up the pedal arms in the same plane of travel with both the clutch and brake rods.
As a side note, it is interesting that the design of these pedals is such that either pedal will fit into either side of the pedal box...now days, in mistake-proofing, designs usually only allow installation in configuration (the intended one) and eliminate any chances of swapping similar components...
Thanks again for the picture.