Computer case will be fine. Wire is cheapest from Rapid:

http://www.rapidonline.com/sku/Cable...119346/02-1066

(I'll buy the spare from you)

I emailed them and they said 2 weeks to deliver it.

Also for the power supply I'd get a bridge rectifier and terminal strip. I'll find them tomorrow when the site is working. They will also have suitable switches for limit switches.