That is a heck of an amp for the price! And the measurements are pretty dang good!
A couple comments concerning the side notes on P/S Filter Caps.
*The general rule of thumb is 10,000 uF of capacitance per rail per 100Wrms. The config here shows to be 6,800 uF capacitance per rail for an amp rated at 120Wrms. Personally, I would have added a little more capacitance. But, 6,800 uF is certainly adequate and the measurements prove it! Big electrolytics aren't cheap, so I'm sure the decision had to be made to keep the cost down.
*In general, ripple on the PS doesn't seem to be a huge concern for amps. By the time you are driving the output into the region to see the ripple, you are clipping anyway (i.e. you have bigger problems to worry about). If ripple were of true concern, it would be handled with regulated power supplies. Regulated power supplies will introduce more problems than they solve for a power amp.