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Hi Bandit, See if you can't do some horse trading with a local tinner or SM man. If not clamp the sheet between 2 angle irons and use a wooden mallet to bend the 90's. You just start the bend with soft blows of about 15degrees each blow all the way accross, then repeat until 90 degrees. When your done it will look like bent in a break if done correct. The key is not to try and bend to much at one time. Make it atleast 6" over size each side of your fire box, with 36" from top of fire box to bottom of exhaust hood. You didn't say how large of fire pit so a 6" round stack minmium. If your area has high humidity then I would suggest a 1-1/2" flat to the inside x 3/4" up, drip lip to the inside bottom all the way around with a drian in one corner. If your existing hood doesn't consensate now this is probably not a concern but still is needed as a stiffener on the bottom of the hood. You can also lap joint the pieces and rivet(no not pop rivets) for that 100yr old look and use angle iron inside for a stiffener hung on chains naturally. Rivet spacing of 3" works well. To add the round exhaust stack to the hood you can notch the round pipe in 3/4" and every 5/8" around the pipe, then bend every other tab out, install the pipe thru the hole then bend the other tabs to the inside of the hood. This makes a great joint. If this is too tuff to understand let me know and I'll draw up something and post it. Tell me which your interested in and it'll take me a few days. T_Bone
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