abrahms are not legal for civilians unless virtually stripped, even then the armor and electronics aren't supposed to be sold or dismantled so you'd just get a shell, tracks and maybe drive train.
my thoughts are to just buy a stripped turret, fix it up again, and get that barrel working again, then mount it on a large flatbed trailer. you could drive normal in a vehicle towing it, then park and set it up like a trailer. unhitch, jack it up and block it up (so you can move around under the trailer), put siding on, get it aimed (how you'd manage that without mechanizing it and keeping it a simple "cannon" for legal purposes I don't know, other than putting a bead on it like a shotgun and probably welding up the breech to make it a muzzle-loader), and IF YOU ACTUALLY CONNECT, woo-hoo. that vehicle would have to be dead after.. maybe two or three hits?
you might flip your trailer in the process, that's why you're under it and not on top- you don't get crushed if it happens.
top that people!