Just had a thought...would be cool if you could find some of the old square head bolts and nuts to add around the wrenches..
I like that, I actually found a couple of railroad spikes in the same building where I get the handle a wrenches from. Was thinking of incorporating them some how. But I like the square head nuts idea. Have to keep my eyes open when I’m in these old boiler rooms. And I have a few old pieces of coal that was burned in the boilers long ago, my boys have them on the shelves in their rooms, lol