DIY amplifiers in this class get expensive quickly, because onesy-twosy parts costs are ridiculous (those big smoothing caps might cost you $50 each), and if you want professional results, like the DIY speaker guys get, then you'll want multi-layer, two-sided PCBs and a custom chassis just like Moon. It wouldn't surprise me at all if building just one - and only one - of these Moon amps DIY cost over $50K, and that's assuming you could design it yourself. (I suspect chassis and board costs would swamp everything else.) Hmmm... DIY amp or kitchen remodel... I think I'd rather go appliance shopping.