I like to add weight to the floats, to stop the model from being top heavy and becoming a tail sitter. Here I have used Three Gree Flexible Nose Weight
The Cs.1 floats are not corrugated, and have different top details, so the corrugations have been filled with putty and the upper details sanded down or filled
Doing a kit bash of the 2 Pegasus Junkers Cl.1 kits and the Revell Junkers F.13W kit to make the late WW1 Junkers Cs.1 - their all-metal 2-seater float plane, which was based on the Cl.1 but with extended wings, floats and a modified tail. The fuselage and wings will come from the Pegasus kits (with 2 needed for the extended wings) and the floats and tail mods from the Revell kit.