Minecraft Warehouse Storage Plugin

I'm looking for a Minecraft plugin that allows players to purchase a warehouse for item storage. The warehouse should be accessed via a GUI-based menu.

Key Features:
- GUI-based menu for access
- Single inventory grid for item storage, no specific categories
- Expansion feature for upgrading to larger storage over time

Ideal Skills:
- Experience in Minecraft plugin development
- Proficiency in Java and familiarity with Minecraft's API
- Strong UI/UX design for intuitive GUI-based menus

Please provide examples of similar work done in your bids.