They look really good. I really enjoy looking at midcentury engineering charts/diagrams and stuff like jeppesen charts. NASA has a lot of good ones. The way the text looks, the line economy, the general aesthetic. Well worth the effort imo!
[0]: https://www.bethmathews.com/shop/partslistdraftpaperfontbund...
What if for digital fonts, there was a way to write the same letter 2 or more different ways? Adding slight variations to the same letter would mimic the effect of using hand tools.