I thought a bit about the electronics for the console panel. I want to be able to control it remotely from a PC. The PC will need to be able to record input from toggle switches, buttons and rotary controls (potmeters and rotary switches). It will also need to be able to switch the lamps on and off. In total, it will have to provide 183 digital inputs, 237 digital outputs, 5 analog inputs and one analog output (for the voltmeter).
The lamps are a bit of a problem. After testing them I found that about half of them are bad and won't light up. They're tiny incandescent bulbs in a plastic casing that plugs into the sockets on the panel. I haven't been able to find replacements for them. Also, the incandescent bulbs would need a buffer stage to connect them to CMOS logic.
Fortunately, the casings are not too hard to open, so I think I'm going to open them up and replace the bulbs with LEDs.
I've just sent off the order for electronics parts to my supplier. I've ordered the Velleman interface kit, a power supply, veroboard, shift registers (74HC595 and 74HC597), orange LEDs, ribbon cable, connectors and a lot of other small items.