1) The raw materials: a green chopping board (Sainsbury's £3.99), a children's toy play house (local 'car boot' £1).
2) Fix the house to the chopping board with a 1" screw thorugh each corner of the house base. Apply some dark grey enamel paint (I used some Humbrol paint) to the roof. Thats it ready to go outside. Rear view of house ..