anyone used this 10" front drum to disc conversion?

1965-72 Dodge, Plymouth "A" body, with 10" drums Wheel Kit

as far as I can understand it uses the toyota previa rotors redrilled to 5 on 4 and 1990 celebrity calipers....
am I missing something. just figuring out if its a workshop stuff I can make. or figure if it would be cheaper just to buy.

I am aware that I will need a proportioning valve