Question: there's a lot of hands-on learning resources on the construction of a simple microcoded processor, or an in-order pipelined processor where the most headache-inducing thing you have to deal with is forwarding results – but is there one on the essential elements of "modern" superscalar OoO, e.g. the circuits that check for hazards and delay dispatching etc.?

It's not that it's magic I would love to learn about: it's that I'd like to know what happens behind the scenes when we say that (for example) "results get reordered in the reorder buffer"!