Ian I used Joeys Place in Edmonton for my H1. It was their first H1 Hummer but they do lots of work on Corvettes and other high-end cars of all vintage and make. The work is first rate as they specialize in restoration. Not cheap or fast, but excellent. The winter is the best time as they are less busy.
In Westlock there is that Precision place but I don't have any information on the work quality there.