I am interested in obtaining a quotation for the design and installation of a soft play park within a budget of $15, 000. The park should include at least four trampolines and a sand play area, along with being suitable for children of various age groups. The design should prioritize safety, fun, and durability. The available space for the project is 800 square meters. Please provide a breakdown of the costs for the trampolines, sand play area, overall design, materials used, installation, and any additional features or customization options. Additionally, I would appreciate an estimated timeline for completion and information on any maintenance or warranty options available.