Cheap china box idea?

Was inspired by a post i seen earlier about the china box. Have seen these before, but has been awhile. Would love to get one but they are expensive. Plus they use a lot of fuel. I had an idea for and uber cheap one i could make at home, just want to think it through and need any ideas or thoughts from those more experienced than myself before starting.
My idea is as follows, i want a smaller version of a china box, could do maybe a turkey, briskett or couple chickens or some ribs. Was thinking about getting an aluminum trash can, could make a plate for the top or even simply turn lid upside down on top and work to make fit. If i did this i thought i could make a hanger to put on handle to put some wood in, if close enought to heat source at top maybe I could get some smoke to add to the food? Was wondering wether or not one of these cans could hold heat well enough to maintain the 300-350 degree temp the china boxes run at? Thought maybe insulating somehow around it? Not sure if this will even work. But think it is worth a shot. Hell if it doesnt work at least i have a new trash can!
Any ideas or constructive feedback is appreciated. If i do go through with this i will post and put up pics to let everyone know how it goes

Thanks Cajunator. Have not seen those exactly like that before. I have thought about the galavanized thing and would not want to use it. Not sure if i could find one without galvanized though.

Have a wood shop and am pretty handy, think i could do one just like those on the links. My only wonder is the first models on those links were just wood?, no metal lining. Just wondering about longevity with bare wood and the heat, and moisture from foods?

Appreciate the info, gives me a better idea. was thinking trash can initially cause I was thinking about that metal lining. This i would just need to make a method to add smoke in the box. Thanks