Those comical shaped peaks around the tube sockets, and rows of studs elsewhere on the chassis, look like the type of terminals Zenith used a lot of. The assemblers in the factory would stuff these cones with leads of resistors and capacitors, "Hand crafted" and the chassis would go thru a wave soldering station. Then excess leads were removed by some sort of saw or grinder. Then after that, parts that would have stuck up in the wave solder bath (like the IF cans) are added. At least that's what a coworker who used to work for Zenith said they did.
