Nice looking coop! Your plan sounds pretty good, and by the time the chicks are a couple weeks old they can probably be released into the main body of the coop until they're a bit older.
A heat plate is a good option. They may not need any heat at all but this gives them the option of getting more heat if they feel they need it.
A heat plate is a good option. They may not need any heat at all but this gives them the option of getting more heat if they feel they need it.