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Ok, the dark grey and light grey boxes are just a picture set out like that in the 'Pictures' folder. The badly drawn gun is the icon of the weapon you have equipped in the inventory. The red bar next to that is the health bar, and under that is the MP bar. Those both apply to the default RMXP HP and MP settings. And under that is how many bullets you have for that weapon. The number should apply to how many of Item 1 in Database you have in the inventory. This will be 'Bullets'. And that's it.
So I hope that someone out there can help me, and that I have posted enough info.