Changing items set up for coal to iron ore isn't that difficult. Pretty much a matter of replacing the word coal with the word iron in the config and script files, changing the product kuid to that for iron, and perhaps a slight nomenclature adjustment here and there (and a bit of testing, lol).
Some script and config files are written in a way that only changing the kid in 3 places in the config file is needed. No changes required in the script file.
One or two of my kickback dumpers are designed to load one of Vulkans interactive barges (with coal). Wouldn't take much to make it work with iron.
I've been working on a Thornberger hoist. Its what preceded Hulette's (and a nightmare to animate, lol).
Ben