One side was in pretty good order with a decent amount of grease packed into the bearing and the hub nut tightened suitably. The condition of the drum internals this side was also pretty good. The other side, which looked like it had a replacement outer drum as it wasn't painted red like everything else, had no grease packed around the bearing as it should and the hub nut was massively over tightened. On opening the hub on this side it looked like one brake shoe had been replaced but the other hadn't due to one being much more worn than the other and there looked to be a fairly new cylinder.
Because I wasn't sure if the hubs were handed, I made sure to take a couple of reference shots. The metal brake pipes were retained and the unions taped once everything was removed so I didn't get any mess into them. Corrosion is actually very minimal thanks probably to the copious layers of paint that have been applied since '77.

This is the properly maintained hub with even brake shoe wear and a dusty but tidy appearance to everything inside.

I was expecting the nuts and bolts to be fairly stubborn, but either I'm getting better at this or they weren't too bad as the hubs came off in relatively short order, reducing the weight of the axle by about half and making it a lot easier to lug about. I did eventually find a spot that needs welding but given how thick the metal is I expect I can do this with the stick welder I've got to good effect. I managed to shear one of the bolts on this bracket even though everything is well marinaded. I wasn't initially going to remove the arms from the axle but it will make refurbishing everything easier and will mean that there'll be minimum chance of rust returning.

The other side is nice and solid, I gave everything a good stab with the screwdriver.

Once I find the wire brush that's gone walkies I can crack on with refurbishing the bits I've removed while the nuts and bolts on the axle marinate in storage since it's now lightweight enough to actually move to a place that's not outdoors. Providing weather is suitable and I have enough free time, I'll have another go at dismantling the rest of the axle.