Seller Portraits?

I was just working on my title sheet for the Kaasa show and had an idea. Why not travel through out Bangkok and other areas of Thai and do a series of portraits of people selling their products on the streets? I am thinking mostly of people selling various cooked/prepared foods, I could do a series of portraits with the 4x5 of all these folks. The guy selling moo tod (fried pork) the som tam lady (spicy papaya salad) the list is endless, and many of the workers have strong expressive older faces. Something to think about, maybe I can do some of this in Mae Sot when I am there in May.