My Piece For Great Kneighton

I got set the task of producing a piece for the Great Kneighton country park. My piece is a play area, below is an image of my small model which is all to scale. The target age for this play area is 8 years +, I have decided to choose this age to work from because this play area will be made out of recycled materials so could have sharp areas and different things that could be a small danger, also to play on this sufficiently the child will have to climb a ladder and be a 2 meter height, which could pose risks.
The main focus and feature in the play area is the mound where I have created small holes as tunnels to go through. The soil that I will be using to build this mound will be out of the area, where they have dug out of the lakes and large ponds.
To produce this small model i have used recycled materials and also used clay instead of soil to try and make a realistic piece.