I also think there's zero power contribution from the capacitors - their function is to reduce the noise that affects MOSFET operation. I've got a whole bunch of things I should be doing this weekend, but I'll see if I can get the gear out again.

In the first image, the peak ripple is 228mV. Eyeballing it says the voltage drop is in the hundredths of a volt range. Anyway, I'll certainly post it up if I can find the time.

My reason for building the cap boards was to make something compact and easy to mount without sacrificing anything compared to the standard ones.