Brake conversion 73 duster

Hello. Looking to get some input
Complete newby to old assemblies, but quite mechanically minded.

So anyway. Can someone please confirm? The spindle bolts to the steering gear, ball joint etc.
Over the spindle goes the 2 tapered wheel bearings?
Then the rotor itself sits over the bearings and gets bolted into place through the middle?

If that's the case, could I then find a rotor that fits my drum spindle, fabricate a backing plate and caliper holder and essentially MAKE a brake conversion kit rather than buying one.

How do I test a good fit rotor to the spindle, and would the caliper bracket be made out of hardened steel, or would mild / stainless be enough?

Would greatly Appreciate any help or ideas