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30W/channel of class A is going to be quite hot, regardless of whether it's idling or running flat out. Any particular reason why you think Class A is what you want?
It really is the wrong way to build audio amps, unless you're working under some quite peculiar constraints.
If you're doing it for fun, then knock yourself out, there's no great difficulty to it - they're simple enough, especially as I imagine you'll also be eschewing feedback.
Note that most modern MOSFETs are crap at being analogue transistors, they're designed to be switches, not to dither around at half-on, when they'll develop hot spots internally and fail orders of magnitude before you'd expect them to.