Check out the lastest Community Blog from the EON Team as they show off a bit of their customization process for your vehicles!

The Wallet panel (Box 3, top right) allows you to keep track of your total financial resources. In-game Wealth (earned through playing and winning matches and accomplishing certain tasks) as well as Credits purchased will be displayed here. You can use the Wallet to add resources, unlock VIP status, and more!

Clicking on menu hexes in the Navigation menu (Box 2, top center) will allow you to access in-game mail, see your inventory, open your friends list, as well as reveal any available MODS or customization for your units. The Button bar also provides easy access to the End of Nations store, as well as the research lab and other locations.
Your Inventory panel (Box 4, middle left) holds all of your unassigned units, structures, and Commander abilities, as well as info on what’s available for purchase.

Selecting any unit, structure, or Commander ability in your Inventory brings that unit to the front view of the Armory and opens the Information menu on the middle right of your screen (Box 5, middle right). Detailed statistics and abilities for that unit will be displayed, along with available intel on its strengths vs. specific enemies!

Source: Customize your Firepower