You can use a small box,drum can or building for use as a "smoke house" . Isolate your fire away from the smoke house, about 10'. You can build your fire lower,in a small pit, and pipe your smoke angled up through stove pipe sections at the bottom or side of your box.By doing it this way ,you have no need to open the smoke house and disturb the process.By isolating the fire it will keep your smoke cool with no chance of cooking the meat. The smoke will rise up and around the inside of the chamber and vent out at the top. You need to cut a vent hole slightly smaller than your stove pipe to allow the smoke to collect in the chamber before exiting. We had a smoke house and this post bought back memories of the taste of smoked bacon and ham and the wonderful smell of curing meat coming from our smoke house. Use wet hardwood chips after you have a bed of coals( no resinous woods at all) to produce thick smoke,surprisingly corn cobs will impart a delightful taste to your meat as well.Cold smoking is my favorite way of curing meat. It the best way to get the taste I like. The larger the pieces of meat the longer it takes to cure.