Yep, but that was only really possible because Scholz was an MIT-trained engineer. Without that (or equivalent knowledge from other sources) it would have been tough.

Nowadays you can buy the technology off the shelf.

And, it wasn't Scholz' first rodeo.

McCartney? He probably had above-average home resources available though

The band Boston and their debut album "Boston" is famous for having been recorded in Tom Scholz' basement. (Paul?) McCartney was not involved as far as I know.

Referring to this: https://en.wikipedia.org/wiki/McCartney_(album) -- home recording in 1970.