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Call me crazy, but in this business of electronics I have NEVER seen somebody custom design a box just to hold a couple circuit boards. It may be too late, but i think it would have been a good idea to pick an off-the-shelf case and put screw holes on the circuit boards to match it. Personally, i'd shoot for one of those standard cases that car amplifiers come in. They are already designed for heat.
On the other hand, despite Missile's worries, bending sheet metal is EASY stuff. I did some 90* angles to create ducting for my race car using a steel table, a couple C clamps, a 2x4 and a hammer..
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