Hi Carl!
In Windsock Datafile dedicated to W.29 there are two photos of your subject. They confirm roundel on rudder.
Author for these photos stated that original report said that 2670 had fuselage sides painted palish or sea green and all upper surfaces (fuselage too) were covered with naval hexagon fabric with floats in natural colors.
Looking at photos, my first doubt is color for wing underside surfaces, in my opinion no CDL, you may see a little white border on roundels that indicate dark color.
I don't know what is "palish or sea green", no trace of this color in RNAS planes too.
My two cents!
Roberto