Our aunt and uncle hosted a family reunion a couple summers ago at their house in Maine. It's a farmhouse that's been in the family for many years and was celebrating its 225th birthday. To mark the occasion, my brother and I spent a year designing and building a LEGO model of the house, both interior and exterior. It contains around 17,000 pieces, and the roof and walls can be removed to reveal what's inside. It was an incredibly fun but challenging project—further complicated by the fact...