Major assumptions in OP's model:
- Tesla has a sustainable 5k/week demand for the Model 3 and won't have to invest in marketing.
I think this is a pretty weak assumption. Tesla still hasn't given us any idea of conversion or take rates for the Model 3. It seems a little farfetched that 65,000 people are going to spend over $35,000 to buy a car every quarter with no marketing expenses for Tesla.
- Tesla will achieve an 18% gross margin for the Model 3.
This seems pretty unlikely, especially given recent changes (more humans, more factory shifts, fewer robots) and just the general uneasiness around Tesla's accounting for warranties, superchargers, etc.