Looks good, but we can't comment without see the schematics. But I think you must have a current mirror with a current sink and those two big transistors are the complementary pair. Standard but very solid setup, if you ask me. Very neat.
P.S. Why are you hiding the coding on your board (top pic leftside)??
they might want to consider a product name change for the U.s. Market
damn fine looking amp though.Discrete means you can play with the biasing or even do parts subs to make this puppy whatever it is you want it to be from a stone cold battery killer to ultralight power to go