This project predates easy and cheap PCB creation.
Even then, they could have at least used perfboard.
No idea why someone would want to do it that way. That was fine for the 1920s, but there's no excuse for such poor construction these days.
> Things have been made much easier by putting the most complicated electronics on a PCB.
maybe it looks like this nowadays?
If you get good at dead bug construction, you can make changes and do experiments as easily as with a solderless breadboard.