Scaled down seaplanes prototypes

[PB4]

Scaled down Flying Boats prototypes

Hi everyone,
I am interested in all scaled down seaplane prototypes of the big flying boats, I have already found info on the following :
- Saro Shrimp, for the specification R.5/39, not produced
- PBM 162A "Tadpole Clipper", for the PBM Mariner
- FGP 227, for the BV 238
- Potez-Cams 160, for the CAMS 161

Any more than these ?

Also if you know any book or place I can find more info on these than google then I am interested.

Thanks all !