FYI - I built a 21U cabinet many years ago and it was an afternoon's work that cost less than $100. The most expensive thing was the metal rails themselves, for $63 back then. I think I posted it around here somewhere but it was over a decade ago...
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That looks really nice and a very nice write-up. Even a 34u rail set is ~$75 and some lumber would provide for a relatively cheap rack.
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