It's been done numerous times. There's an STH-10 mounted upside down, a pair of first gen Federal Type Mach. Bs, a Sireno vertical, and a few others come to mind. https://media.discordapp.net/attachments/1157756572068483252/1232143534870626354/unknown.png?ex=663245d6&is=6630f456&hm=a12022fc9...