Fitting an Entire Loft Staircase in a Tight Space

Why would someone design a staircase like this?

As part of a concerted effort to upgrade the workshop, I've made my previously useless storage loft useful by adding a custom stairway.

But, with limited room in which to fit it, I opted for a space-saving, alternating-tread design.

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Folding Heat Shield to Cool My Workshop

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Making a Space Age Neon Sign for a Drive-in Theater