Paper: square with a side length of 15 cm (6 in), red/white kami
Left: 9 cm wide, 10.5 cm high
Right: 6.25 cm wide, 9.75 cm high
Sy Chen gave no diagrams, but did provide some photos suggesting the models were easy enough to fold that you could probably guess the steps by looking at the photos of the finished models. Mine look slightly different, but I believe they're close enough to be called Sy Chen's designs.