Zoran
I just saw the link to this old post of yours and I am inspired. I have previously converted an old 4 draw filing cabinet into a full on smoker with its own internal fire pit which was just fabulous for smoking trout/chicken/pork/ beef brisket but had to get rid of it when we moved 4 years ago. With your method I could smoke fish outside usi ng the BBQ for heat. You ahvave just given me my next project!!
Cheers
Robbo