You might not get any results with paint stripper if it's a polyester finish. It wouldn't touch the finish on my late '70s Ibanez ST55 (with about 2mm of black polyester finish on it). Even polyurethane might be quite resistant as the paint's polymer chains are very long so don't let much through. In that case it's sanding all the way. A belt sander will help strip it relatively quickly on the flat surfaces and I'd use a detail sander on the curves and edges.