I originally done it on a mk1 cortina back in 1992 the only concern I had was the wheels didn’t fit that I wanted to use so check you have clearance
you need to weld a bracket on the tunnel for the handbrake and use a mkv rs2000 handbrake cable as it’s shorter than a Sierra one you will also need the dog bone from handbrake to cable
Sierra calipers I had to take 10mm off the mounting face to line the caliper with the disc
I used Peugeot front discs and you have to take 2mm off the halfshaft flange outer diameter for the disc to fit over
you just need some caliper brackets for the axle which most places sell