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"Since they keep ramping up production, especially of model 3"

They're pretty close to maxed at the Fremont plant. They have been able to get the production numbers they have been doing due to the young age of the equipment. Older car plants spend more down time doing regular maintenance so they aren't shutting down the line doing repairs. Tesla will find the same thing out before long. If they have to ask people to clock out and go home very often, they will clock out permanently and find a better job. The paint plant is another bottleneck. California is a nightmare when it comes to painting or any other process that creates fumes or particulate matter. A little bit of arithmetic shows how fast the robots have to paint each car to keep up and there could be other processes that just take the time they do regardless of any "plans" formulated by C-level executives. The only way around the bottlenecks is to create secondary lines and there doesn't seem to be any more room for more tents unless employees park their cars someplace else and are bussed in.

There was a really great 3-part series with James May as they followed a car through the Mini plant. It's a treasure trove of information about modern mass production of cars and worth digging around to find a copy somewhere. A Mini comes off the line there every 63 seconds when the line is running. The really good bits are when they talk about automation and what holds makers back from using even more automation. Find it and have a watch if you are interested in the car biz.