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is that a strip the whole length of the inside of the lid
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Yes - aluminium angle, not a flat piece
Flush with the edge
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How thick is the strip of aluminium?
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Each side is about 12mm - Bunnings - whatever thickness the 12mm angle is
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Do you think running 2-3 strips along the bottom would strengthen the bottom of the box?
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You would need to run angle for increased stiffness - strips of flat aluminium will still tend to bend - I just use the original box bottom without any reinforcing and it still works (so far - touch wood).
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This is my first electronics job EVER
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Don't worry. This is not a challenging job electronically. As regards the meters, if you use them, the voltage meter is connected to the positive of the first battery(+ to +) and the negative of the second battery (- to -); the amp meter is connected in line with the positive feed. The connections on Amp meters usually are marked + and -. Ignore the - and don't connect that to the battery negative. Positive on battery to - of amp meter, positive cable to switch, fuse, sockets from the + side of the meter.
If this is too confusing, I will attempt another diagram.