What the others have suggested is exactly what I have done before. We did the Indiana Jones ride at Disneyland and all the fixtures were custom made to look of that era. Wiring was to current codes and concealed. fake wiring was added in some places to look like it was being fed overhead. Special lamps with the markings on the side were used (instead of on the bottom)custom frosting and effects via dimmer control modules. It can be done but it may be expensive.
