Inventory screens and whatnot are no small task in GB Studio and definitely goes outside the scope of what I can provide here.
As a suggestion, in Abducted I simply used a dialog box with inline variables for items. For a new project I’m replacing unused characters from the font file with item icons and using those for key items.
Just note that the graphics for rendering the view uses most of the tiles allocated in GB Studio so you’ll need to account for that if you plan on incorporating such a thing into the background tiles.
Also to answer an earlier question, GB Color mode is not supported by the plugin. You could maybe use a single palette for the view without trouble but that’s only a guess and not tested.
As I mentioned in a previous comment, changing the dimensions of the viewport is not trivial and not something I’ll be supporting officially.
The goal of the plugin is to be a very niche thing: a “letterbox” first person view for classic grid-based dungeon crawl games like Wizardry or SMT. The most those very visually limited games have on the screen other than the view is usually text representing characters or player stats and other simplified things, which you can do using dialog boxes. That I managed to get a minimap in there is more than those classics usually offer. Doing more than that goes outside the scope (and spirit) of the plugin.
If you have the plugin, you’re more than welcome to change the code yourself!
If you do, keep in mind that reducing the size of the view does not necessarily free up many background tiles for other things. The example background uses the maximum amount of tiles for a GB Studio background already and it’s not very complex art. You’ll have to determine which tiles are not going to be used after the changes and remove them from the image to calculate the new tile count. The number of tiles you can reclaim may or may not be worth rewriting the plugin.
