I think this is the wrong way to go about site minimalism. My personal site[0] is pretty minimalist--the home page has one request for 3.3 KB. But it doesn't sacrifice in the same ways this site does: it keeps readable source code, it still uses BEM classes for maintainability, and it has a working menu on the same page (rather than requiring visitors to load a seperate menu page). So, with less than half the kilobyt…
They would not be transistor radios in the 1930s. Battery radios had valves/tubes in them and two kinds of battery. The picture is a very late 1950s/early 60s transistor radio.
Nice site, interesting content, have you ever come across the British judge Lord Denning? He was a mathematician to begin with then turned to law having decided that teaching was boring.