Gasoline Alley, Performance Road, & Byers Creek Road commercial parks
Visited 2015, 2018 & 2019
The Skinny--The majority of Nascar's smaller lower-series teams are based out of Mooresville. The vast majority of them are not open to the public, or if they are, have virtually nothing to offer. My advice would be to skip these shops unless you're a fan of one of their drivers--and then, email ahead so someone knows you're coming.
To See and Do: 1 (see above)
Accessibility: 2 (see above)
Gift Shop: 1 (see above)
Friendliness of Staff: 3 (see above)
Final Verdict--Skip it, they're not made for the public (unless you have an appointment ahead of time).