Made up this wooden box 350m x 350mmx 510mm ish .The entrance is 150mm square. The pipe allows for air in the chamber when the box is covered with logs and leaves.
Found a quite spot in the garden hidden away near a Laurel. Positioned the box on a slight slope for drainage.
Cover the box with logs and leaves and a little soil here and there.
The entrance way is kept clear with a log passage.