Patchwork or assembled construction made with gatch, or more generally, any crude or improvised assembly of mismatched materials.
Compound of gatch plus work. An uncommon term that follows the English pattern of adding 'work' to materials (patchwork, stonework, etc.) to describe what's constructed from them.
Gatchwork is basically the construction equivalent of a Frankenstein's monster—pieces that don't match perfectly but somehow hold together, which is actually how a lot of real buildings look underneath their finished surfaces.
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