I don't think much CapEx is needed in 2016 for Model 3 tooling. I think that comes in 2017. But honestly I don't know the lead times involved.
could be the case in 2017 they spend SOME of the CapEx needed to produce some rate of Model 3 and then later in 2018-2020 they keep adding more CapEx to increase production. Model 3 expansion of factory is multi year like GF
I fully expect the CashBurn/CapEx question on Model 3 to get fully addressed on call today.
Remember that Tesla has a factory, stamping presses and now a paint facility capable of producing 500k cars. They also built out the BIW line 2 to produce the X that will transition to both X and S. So all of the BIW line 1 will be available to be configured into the new model 3 line. So a good chunk of the CapEx for model 3 production is already on the books. I'm not saying it won't take a whole lot more, but it might not be as much as some are predicting.