I grew up around Abilene and down there all the time. Great place to live and plenty of buildings to build a nice shop without code enforcement going after you. I would still check in case you want to ever build a paint booth or anything like that.
I always check code enforcement and zoning before I buy property anywhere. Better safe than sorry. Also at 5000 sq ft. , you might have a problem with Fire Marshall unless you have sprinklers.
Now is the time to check all this out not when you are going after a C.O.