The easiest option is a two-storey structure in which the lower part represents a cavity for firewood, and the top is actually a hotbed with a pipe over it. Begin to build the Foundation. Great depth as when building a House, is not required in this case. For Foundation pit 30 cm depth, sets the formwork and metal fittings (go any pieces of iron, wire, pipes, etc.), then poured concrete.
This concrete will also “Paul” in the wood. Filled the Foundation should stand for three days, after which you can continue to work on. In the design of the grill you will have at least two of the opening. If they assumed direct, you should arm yourself with pieces steel corner jumpers if arch, it is necessary to make a template out of the Board. Pattern gives arch bricks, with the bottom bricks touch each other, and the top seams have maximum thickness. Centered is a central brick is a prerequisite.