I have a complete set of machine tools in styrene, HO scale. I wish I could remember who made them, but they're still available, as I saw a bag of them in the hobby shop last week.--- I've just returned from digging through a couple of Walthers' catalogues: nothing in the 2005 one, but I did locate them in the 1995 version. They're made by Noch, part no. 528-1104, and as I said, still available locally. The 1995 price is $5.99 and it appears as though I have more than one set. I'm unable to identify all of the machinery, but there's a lathe, about 11' long overall, a bank of four drill presses, about 6'6" tall, a large milling machine (I think), and two others, possibly a shaper and a boring machine, but that's just a guess. They're cast in dark grey styrene, with some detail cast in relief and a few add-on parts, like the drill presses need to be glued to the stand, I think the lathe is 3 or 4 parts. Nothing too complicated but quite well detailed, considering the price.
Wayne