Eddie Heath, from Dilhorne in Staffordshire, built the Buckingham Palace replica from a thousand wooden pallets donated by local companies.
In the past, he's built models of Big Ben, the Tower of London and the White House, but will now hang up his hammer.
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The wheelchairs are specially adapted for disabled children to use during sport and exercise and are a lifeline for those who use them.
The Police Service of Northern Ireland and the Met Police have been asked for any information that they had advanced notice of the attacks.
Storm Doris bringing heavy rain and gales.