I've seen them. I've used a tall "chicken" rack (not built for the beer can) to cook a small turkey vertically and it worked well. I'm thinking a 10-12# turkey would turn out pretty well with the "cannon" and the base would catch all that great juice for gravy!!
Southern Brethren BBQ Competition Team
"It's all about getting paid!" - Myron Mixon
"I love being hated in my hometown!" - David Hair
KingFisher Gator Rotisserie cooker, WSM, Stainless 5 burner with IR gas grill, Turkey Fryer, Weber JD Commemorative grill, slightly used Bandera chamber for future use as a cold smoker, Masterbuilt 40" insulated ELECTRIC smoker