I have an idea, but I don't know if it works, and you can do this after you complete porting it over when you have time... If it's possible, try taking the non-fixed ramp and allowing people to sit on the ramp if it's leveled. But once people sit on the ramp, they aren't allowed to raise or lower the ramp anymore. If you do that, maybe making an option to replace the middle "seat" with a machine gun?
But of course, work on porting it over first!