Most automation mods i look at have interiors. I've tried but i suck. could somebody explain to me how to do them because my cars are Crappy without them
The way you do interiors is by selection 3D mode. (just above the paint selection for fixtures) Then, if you select 'W' to put it in transform mode, you can use the arrows to drag the fixture INSIDE the body/windows. This 3D mode also disable fixture morphing, so they stay the correct shape. To make the windows transparent, on the right of the screen there are some view settings (hide/show parts of the car, lights, etc). One of them is "Window Transparency" or "Window Opacity" or something like that. Adjust the slider on that. The transparent windows will remain when exporting to BeamNG.drive. Hope this helps! P.S. Have a look at the Automation workshop on Steam - there are loads of easy to install mods there, including interior parts.
Also if you are REALLY planning on making it look good, u could use the stock 3D fixtures to detail the interior.