This year I wanna go monster as well
Hope u have a good spot n no trespassers tho. Monsters draw a lot of attention
a couple years back I did one in a raised bed with mostly fresh soil sourced locally and a bunch of other things accessible locally. Killed it.
I would recommend some sort of amended earth with box or fab pot on the ground and create natural drainage in the surrounding earth. Not a fan of the bucket bc anything 20gal or more get heavy quick if ya plan on moving them, or top heavy if big in a small bucket with more upkeep. U could also put em wagons, a trailer, or pallets and move em around if ur privileged to have that option.