Got the frame and wiring in.
CablesSteppers - I've stripped four cores from a multicore cable that just fits through the frame and have adequate gauge - 4 x 0.34mm - LÜTZE SUPERFLEX - Lutze part 117305 (datasheet attached)
Heatbed - Two cores from a high temperature silicone cable 2 x 0.75mm - Lapp Kabel - ÖLFLEX® HEAT 180 SiHF - Lapp Kabel part 0046001 (datasheet attached)
Main power - 2 x 1.5mm tri-rated
Switches - twisted pairs from cat5 cable
SpringsI had a problem getting hold of these easily in the UK - I found a company that happened to produce long lengths of exactly the same spring required for another customer.
I'll be putting ferrules on for the terminals and putting the connectors / motors on next.

- basic mechanical and wiring