I have both an electric and a charcoal ECB. Just a question, why do you want to convert it? Wally world has the charcoal ECB for about 35 bucks. Buy one and enjoy both worlds. That electric one can come in handy on weather challenging days. But if you want to convert, especially cheaply, then here is my other 2 cents. For the base, go with bricks or blocks. Anything that gives about a 6 inch space under the main cabinet area will work. For the charcoal pan it is relatively simple to make. Go to a garage saleor thrift store or whatever and look for a cheap round cake pan. Drill some holes in the bottom. Go up on the sides with some expanded metal to finish the basket form. Then you have the charcoal pan. I discarded the legs on my ECB years ago and use red clay bricks stacked up and set the charcoal pan right on the lip of the bricks. Then every hour or so you just pick the hole thing up off the bricks and set aside, shake the ashes out of the charcoal pan and maybe add a few more pieces of charcoal or wood chunks and replace the smoker back on the bricks. It works great. Make sure you make a vent up on the lid to get a good airflow. A few half inch holes in a 4" circle work and then atach a piece of sheet metal or frozen pie crust pan onto it with a sheet metal screw to regulate air flow. I even saw a guy once that converted his into a pellet burning ECB. He just cut a small hole in the side and ran a pipe from there down to his pan to drop pellets in. Worked great. I am looking into finding a cheap ECB to try that mod. Of course that comes after I build me a UDS.