In one of the most ambitious and eccentric builds ever, a man attempts to build a miniature canal and lock to house a narrow boat - and then turns the boat itself into something never before seen on the series. George also visits a house full of colour in London and an all-black, one-bedroom hotel housed in an old industrial crane in Denmark, while Will Hardie checks out a wooden home in a horsebox. Together, the pair put the final touch to their 18th-century-inspired cabin in the sky.