I can certainly relate to all of the above!
Spent some time at Univac in the60's. Their idea of a mini computer was three feet high and made to fit through a 24 inch ship hatch and some others about the same size that may still be running our air traffic control.
Sometimes had to debug the ancient Univac One mainframe...walk around in the CPU with a dust rag , power off, and remove stray insects.
~Richard