Malc - maybe the best thing for you would be to get one or two books such as "the Original Mercedes SL" by Laurence Meredith, available through "the usual suspects" (Amazon, larger book stores etc). It has many detailed photos of in- and exterior of the various (230, 250 and 280) models and although not always 100% accurate, with the project you have undertaken it will get you underway.
Cees Klumper in Amsterdam
'69 white 280 SL automatic