yes to being a locker, you can unlock the hubs to get your steering back when you dont need the locker, though times like on the beach when you want 4wd but dont want a locker they are very annoying and make steering through windy sand tracks difficult
on a side note, I know of a conglomerate

pretty set to bid big on that item, the welded bit wont be required and you dont need the steel parts so perhaps a deal could be made
