Diesel Jim conversion write up (
link)
Option 2 from this blog (
link)
I followed these two guides and found it fairly straight forward. Although it is not a cheap conversion.
I used a combination of both guides to work out a parts list. My main problem was tracking down all of the parts second hand. In the end I bought the caliper mounting brackets new, NOS stub axles, and one of the hubs (very annoyingly the pair I bought second hand were not a pair and one was from a later model). I managed to get second hand calipers which I then refurbished myself with new seals and stainless pistons, and managed to re-use the brake discs off the hubs as they were nearly new.
Not had any problems since doing the conversion although I cannot say I noticed much difference either, even when towing a loaded car trailer. The only advantage is they do not need constant adjusting to keep working.