I see Milton had a kit.. requires sourcing calipers as well.
Whats my budget domestic option for doing this conversion using my stock struts?
105E - Discs on Stock Struts
Making the bracket is not the problem. It's finding a disc and caliper set that would fit the 105E spindle. ( Cortina discs / calipers won't work ). Milton is your best bet. The kit is 188 pds without the calipers. You would need to find Escort MK3/4 or Nissan Micra calipers. Nissan Sentra cailpers maybe the same but not sure. You can goggle and find out what's interchangeable.
http://www.milton.105e.com/
http://www.milton.105e.com/