coachbuilder

Short definition from Wiktionary

Noun

1. 1
   A builder of horse-drawn coaches.
2. 2
   A person or company who makes and fits the bodywork of vehicles such as cars, buses, and railway carriages.
3. 3
   A person or company who makes and fits the bodywork of vehicles such as cars, buses, and railway carriages: A car customizer, such as limousine conversion companies.