The Explorer Box is a flexible design. One of the areas you can tailor is the Chuckbox style front kitchen / galley area. It’s straight forward to optimize the shelf layout based on the items you normally take.
When planning a layout begin by gathering all you plan to pack inside; Look at what would go together on a shelf, needs a shelf of its own, and what could be grouped together in a drawer. I find that Sterlite plastic baskets work nicely as a drawers and are readily available at many stores.
I then use cardboard to mockup the layout and sizing. This is an easy, cost-effective and quick way to test clearances and try different ways to organize things.
Once you’ve worked out a good layout, use the Explorer Box manual as a guide for the building method and to document the dimensions. Here is a recent one I’ve been working on that has a wider than normal front door and doesn’t use a side door.