I really appreciate the answers provided to my questions. I have learned more about what NOT to do than what TO do.
If I want to have a metal barn on a lot in Polk County, I must buy a lot zoned A-1 for Agricultural use. Here's the type of barn I'd like to get:
I checked the zoning rules for the adjoining county, Haralson, and found the rules for R-1 to be less restrictive:
http://haralsoncounty.elaws.us/code/coor_apxid153442_ch50_artiv_sec50-108
http://haralsoncounty.elaws.us/code/coor_apxid153442_ch50_artiv_sec50-109
Polk and Haralson counties are 50 miles west of Atlanta, and have missed the movement of people from the Rust Belt to the Sun Belt over the past 40 years, due to the lack of high-paying jobs in the counties. The median family incomes are $43 - $45 thousand a year. Rural land cost $6,000 an acre 5 years ago, but it has dropped to $5,000 an acre.
Here are the reasons to get a bigger garage:
http://www.trfindley.com/pgcars.html
Here's a nice house on 8 acres:
https://www.georgiamls.com/762-macedonia-church-rd-buchanan-ga-30113/8401825
Thanks for your help.