Plastic Storage Shed Design

I'm looking for a creative and functional, MODULAR AND EXPANDABLE design for a medium-sized (50-100 sq ft) storage shed. The shed should be made of durable plastic materials.

Ideal skills and experience:
- Proficiency in designing storage solutions
- Experience with plastic materials
- Knowledge of structural integrity and durability requirements for outdoor storage sheds
- Ability to create detailed design plans

Please provide design plans that are easy to follow and implement.