You have a lot of great shops within a few hours of Nashvegas. I've listed a few below but I'm sure there are more.
Charlies Custom Creations (
https://www.charliescustomcreations.com/) isn't as well known as those that follow but checkout his instagram. He's in Murfreesboro so likely the closest to you out of this list.
Down the road a bit in 'Bama we have the following awesome builders. Most of these are pretty active on Instagram so checkout their info there. I'm sure there are others as well that I'm forgetting. Sorry :-(
Big Oak Garage
Goolsby Customs
Greening Auto
Johnson's Rod Shop
Vini's Hot Rods
Mike Goldman Customs over in MS has built some great rides as well.