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For Sienna, it was a "lucky" experience to tackle bricklaying, joinery, plastering and now plumbing.

He was a keen musician, a skilled carpenter and lived in Germany for 25 years where he ran his own joinery business, the family said.

He plans to take her on as an apprentice and put her through a joinery qualification at a local college.

“I’ve been calling it passive joinery,” Mr. Twardzik said, because the construction, inspired by foldable camping chairs, does not require tools for assembly.

"This included internal finishes, joinery, supply and installation of bathroom suites and kitchens as well as electrical and mechanical work for the apartments," they said.