There isn't much an amp designer can do with Class D besides swap out the factory power supply and add an input stage.
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Quite a lot but most have moved on from Ice modules and use others.
Diy guys do the same with Nelson's first watt designs as well,but they generally have his blessing.
It's not just amps either I've seen and heard some very outstanding sounding speakers also.
What can you say, Some folks just love to do it.