For the sheet metal work on cheesy grade atx case steel I like to use a small reciprocating saw, if you have padded clamps to use it works really nice. Even an angle grinder will burn most of the cheap steel or beer can grade aluminum they use with cases typically.
Are you using the ducting just for a cold air setup at this point?
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Are you even remotely serious?
The beatings will continue until morale improves!
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