My city needed gas stations so I decided to build a Shell. I've included the images that go on the building in the zip file, I filled the shelves and interior with random stuff to give it more life, however it could be made better with some creativity.

The gas pumps do not spawn in with the schematic as they are FUNCTIONAL with the Realistic Car Datapack:
www.planetminecraft.com/data-pack/realistic-car-datapack-1-17/

To get the images to work on the building you need to apply them yourself using the Custom Images plugin:
https://www.spigotmc.org/resources/custom-images.53036/

I do not own the rights to the logos included in the zip file, use at your own discretion