Whisk rice flour, mochiko, sugar, and tapioca starch together.
Add coconut milk and almond extract to your dry ingredients and whisk very well until homogenous.
Pour your batter into a shallow dish lined with a wet cloth. Place another wet cloth on top.
Put your dish into a hot steamer (I use a deep skillet with a steamer rack and a 1/2 inch of water), cover with lid and steam for 15 minutes.
Dust your work surface with katakuriko and dump out your cooked rice dough.
Separate your dough into portions for dyeing, if needed. Use gel food coloring of your choice to dye your dough and knead until the color is evenly dispersed. Add more katakuriko as needed to keep your dough from sticking too much.
To assemble individual wrappers, take a small piece of dough from each color and squish together to form a ball. In order to ensure your mooncakes are evenly sized, it helps to weigh them out. When making 10 mooncakes in 50g molds, my wrappers were 25 g each.