Well, I got a bit done today.
After running around town half the morning chasing filters and hinge pins, I managed to drive the broken pin out of the second passengers side door hinge.
I'd tried a press and heating it but what finally worked was soaking it all in a diesel. It was still incredibly tight, but it eventually came out. I was then able to attack
both hinges with the wire wheel, giving them a couple of coats of etch primer and finally giving them 2 coats of Camo Green.

They came out pretty good. They just have a bolt dropped in them to hold things together so I can open and shut the door to keep the weather out.
I found that the F100, F150 & F250 series used a 11/32" hinge pin that was 4" long and has almost the same head as the original IH ones.
I tried getting some locally but the Ford dealers will only sell me complete hinges and none of the other parts places carried anything.
They actually suggested eBay. Ebay it is then. I have a guy here in Aus happy to send me 4 but I won't get them till after the New Year. Oh well. At least I can close it up again.
Once I had the hinges done, I started on the radiator support frame. The upright sections were in very good condition.
They still had a thick layer of red primer on them. The heavy bottom section that holds water, dirt and dead bugs from the radiator was very rusty.
I got into the whole thing with the wire wheel and took it all back to bare metal. The bottom rusty section looks like it has a rough finish,
as it has a lot of light surface pitting, but with a couple of coats of etch primer and Camo Green on it, should last a few more years.

I thought I would get in and flush some of the orange slurry out of the engine while the radiator is away getting resoldered. I carefully aimed the
bottom radiator hose away from me so I wouldn't get soaked, turned the hose on full bore and stuck it in the top hose. Maybe next time I will remember
to take the thermostat out first. It was pretty messy. And it didn't taste good.
When I took the thermostat out, I found the hose was about half blocked just above there with some sort of hard rust encrustation. When I dug it out with a screwdriver,
I found it crumbled down to a sort of sandy grit. Not sure what it's from. The water I flushed through the block only took a few mins to clear up. Both radiator hoses are extremely stiff.
I'll probably have to replace those too.
The MK4 RPS lists the thermostat as IH part number 889622R92. The one in mine is actually 108120R91 and gated 12-1973.
Either the MK4 had a different thermostat, or they changed it between when mine got its thermostat fitted and June 83, when the RPS was published.
My thermostat also has 170 stamped on it. I'm guessing that's the opening temp in °F.
Once I get the radiator back I will refit it and run a dose of radiator flush through it all. Once that's done its job, I'll put a good anti-freeze/antiboil mix in.
I doubt it's ever had it before.
Tomorrow I will pull the seats out to fix them up and keep them dry as I intend to wash the entire cab out. Once that's done I can degrease and hose down the engine from the top and below.
When its a bit cleaner in there I can start measuring up brake, clutch, fuel and air lines, so I can order the tubing in.
Greg.