Thanks for posting V_R I have a smaller Zallman and a couple of years ago I looked into making a similar set up.
However I could not find a decent TEG module at the time and could not afford to try out the cheap asian offerings. If they had not worked I would have been totaly skint with nothing to show for it. There were Y0u Tube vids showing working setups. Also I did not have the required knowledge for the electrical side of things.
Your post reignited my search and I found this company which seems to have reasonable prices for the parts I would require. So I am ordering today.
I'll post back with pictures when I complete me project.
If I could afford £60 I would get one of these to run a fan and charge batteries and some low level led background lighting from me stove in winter as it runs 24/7.