Coal Hopper Shed Design

I'm seeking a skilled designer to create a shed specifically for housing an over-dump coal hopper with a capacity of more than 20 tons.

Requirements:
- The design should accommodate the dimensions and weight of a coal hopper exceeding 20 tons.
- Ensure durability and stability, considering the heavy load.
- The shed should protect the coal from the elements and prevent spillage.
- Ventilation design to minimize dust accumulation and ensure safety.

Ideal skills and experience:
- Expertise in structural design, especially for heavy-load applications.
- Experience with materials and techniques suitable for coal storage.
- Strong understanding of ventilation systems.

Please provide relevant experience in your bids.