This is a sketch design for small pavilion cantilevered out over the canal near Camden lock. For durability it will be made from oak which may or may not be painted but the underside of the roof will be gilded so that reflections from water's surface illuminate the inside

This is one of the most successful planting schemes I have ever done. Yuccas and daisies mass planted in a series of galvanised troughs on a roof terrace in central London, seen here in September 2009, 3 years later, in full flower. They have survived drought (faulty irrigation system) and howling winds.