I made a Baby Bertha (long lens SLR built around a 2x3 Graflex RB Series B). An account of Berthas and my adventure has just been published on the French large format forum in English and in French. See:

http://www.galerie-photo.com/baby-bertha-6x9-en.html (English)

http://www.galerie-photo.com/baby-bertha-6x9-fr.html (French)