While I have heard Paul Bracq's name often in connection with the W113, and seen beautiful drawings of the car by him, Guenter Engelen in his book "Mercedes-Benz 190SL - 280SL, Vom Barock zur Pagode", which by many is regarded as the bible for the W113, squarely says that the shape of the W113 was created by the MB designer Friedrich Geiger (who also had designed the 300SL), and the Pagoda hardtop was designed by Karl Wilfert and Bela Barenyi, based on a patent by Barenyi (that a concave roof would be more stiff in an accident) (Engelen, 3rd ed. page 111). Engelen mentions Paul Bracq, showing a fastback-coupe version of the W113 proposed by Bracq, which never went into production (Engelen, page 135).
Klaus
1969 280 SL