Creating your own galvanized tub garden/planter is really quick and simple. I created these on a smaller scale, a great planter for your patio, but you could get a large trough which make great raised garden beds for your backyard.
Like most projects, it's easiest to do a few at a time, so you don't have to get your supplies out again and again. Especially with larger tubs, make sure they are where you want them before you fill them up. They get really heavy.