Thanks for all the kind words - I must admit I'm pretty happy with the way they turned out.
Still planning to make another one in between in size. The small one will hold taps from M5 to M16 - but I don't think it really has enough length/leverage to drive an M16 tap cutting a new thread, fine for use tidying up an existing thread though. And a matching die holder is now required.
Still thinking of what I'm going to do as a surface finish to stop them rusting and keep them looking good. Most stuff I just heat and blacken in used motor oil, but may try something different with these.