Marine captain Jon's life changed for ever when he stepped onto a land mine in Afghanistan and lost three limbs. After viewing many uninspired specialist homes and considering awkward conversions, he and partner Becky realised their best option was to build a property themselves. The design is cutting-edge, with sleek glass walls, open-plan spaces and a dramatic wing-like roof, and the couple want there to be no noticeable adaptations. However, they soon use up their budget of £250,000 and encounter problems with their incredibly tight schedule. Kevin McCloud follows their progress.