Implement drain pipes in walls
Implement window sills
Where the sill is not high up, ie is less than 3' off the deck, use stone window sills. This can withstand people leaning on it and there is no danger in an earthquake. For high up window sills, use EPS.
Implement window surround
If needed, wrap fiberglass mesh into the window indent. Secure the lath mesh under the window nail edge.
Details are here .
It is worth living with the scratch coat for a while to check it does not crack.