Hi and welcome.

I did up an H59 a few years ago.

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Found a beaten up one in the US so it was cheap and imported it into the UK. A few bits missing which I replaced or made.

Neck wasn't a straight as I'd hoped for, and with a non-adjustable truss rod there wasn't much I could do apart from massage the fret heights a bit. It played OK, just not as nicely as I'd have preferred. Sometimes there are benefits to newer instruments!

All the best with your build, and don't forget to start a build diary.