I have been to the workshops this saturday for thermette. In one of the shops I have been the shop owner showed me a semaver that he made. It is a chimney type semaver a little bit larger than the thermette but shorter. The price he asked was 7 USD. It is made of tin. I did not have much time to look for a copper one. If I can find a copper one that will be excellent, but if I can't I think I will buy some of this tin one!
More water capacity and it has a tap on it.
Burak