Not only that, but smaller, non-union productions also do everything at the last minute. This is possible in Los Angeles, where there is enough work to go around to support a lot of people in all the specialties - you can call your contacts and someone will be available. Getting custom props or set design on an 8 hours' notice is possible. Only larger projects can afford to have all of the production requirements planned in advance, something that you need if you are planning to film somewhere without a well-established film industry.