I love my little homemade stoves. I can have one built in about 10 minutes with the right tools. And about 20 minutes with just a multitool. I cut both sections the same height. Always drill before cutting, it is a lot easier that way. I usually make small snips around the base of the burner, just to ease insertion. A set of micro sized drill bits from harbor freight will allow any hole size and pattern you want. I havent been able to really see a huge difference unless you go with wayyyy too many holes, or wayyy too few. But 16 to 36 itty bitty holes will burn 1 oz. of denatured for about 10-12 min. and will boil a pint of cold tap water in about 3 min. Your burner pattern is mostly determined by your pot. Wide pot = sideburner, small pot = inside the rim. I normally do a mixture of holes at different angles. I have probably 10 or 15 of these little jewels sitting around. The kids love to make em. I have done the spring loaded filler hole, the penny thing, and just a few 1/16th holes for filling, they all work fine. One thing I have found is that about 1 fat tbsp. of pearlite in the base will prevent most accidental spills, and seems to regulate the burn a bit. Please check the links already posted for all the details, but remember these few things for sure: Leaks, as cheap and easy as these are to make, dont try to hang on to a jacked up stove, it is dangerous. Ventilation, DO NOT use this in a small tent, a car or a small room, the fumes you dont notice are very bad for you. These bad boys are cold sensitive, light one in a small bowl or saucer and when it is really burning good pour icewater around the base, not on it just around it. You will see your fire disappear. Therefore a good preheating base, and a windscreen/heatshield are your friends. Yes 91% Isopropyl will burn, but not well, and very dirty. Overall, the designs are too numerous to list here, but all work pretty well. My BOB has 2 stoves stored inside my 12 oz stainless mug, and 6 oz. of alcohol. They are a great asset, and a lot of fun.