That cannon would look good sitting in my front yard!
Several years ago at a colonial trade faire I came across a gunsmith who had a "wall gun" for sale. Wow! I wanted that thing! It was about 6 foot long overall, flintlock, had the swivel or whatever you call it attached, bore size was approximately 1 inch. But, I just could not justify the price. I don't remember exactly, but at that time I think it was somewhere around $5000. It certainly was a beautiful piece of work.
Know what you believe in. Fight for your beliefs. Never compromise away your rights.