Overall battery costs are still too high for something like that, and we are talking US labor rates (not say . . . Vietnam). I would put total "cost" if I had to pull an "out of the air" guess for the TX 4680 MY in the ballpark of $35-40k currently (not counting amortized costs of the factories, etc - just materials, labor, and other direct inputs).
Here is some rough maths on that relying in part on my sometimes suspect memory. And a lot of wild guesses.
A Fremont made 50 kWh Model 3/Y costs about $30,000 to make? (I seem to remember $29,000 for some reason) - We can partially deduce this from gross margins, but China is a complicating factor.
Labor on a Model 3/Y at Fremont $9,000?
Battery pack I'll assume $8,000, cells $6,000?
If my numbers are off, we can try to source better numbers.
We need to talk about when Austin is fully ramped no earlier than the end of 2023. The cost of cells probably halves to $3,000 but we may need to add back $1,000 for depreciation on the 4680 production equipment. Overall saving $2,000 on a 50 kWh pack.
A Chinese 50 kWh LFP pack might be $4,000 in China? But by the time it is landed in the US we can add some additional costs perhaps now $5,000?
So if Tesla could make the Austin Model Y with a Chinese LFP pack, they might save another $1,000.
For the rest of the car, I think the improvements with front and rear castings, workflow and ergonomics possibly save another $2,000.
So an Austin made Model Y might be $4,000 cheaper than a Fremont made Model Y (by the end of 2023), possibly costing around $26,000 to make.
The $30,000 number (if remembered correctly), was from a long time ago, and many parts components and raw materials might have been cheaper then,
Partial justification for my numbers is the Munro teardowns and the lavish praise of the Model Y design from Munro staff on many aspects. Munro don't just like good design, they like good design which saves money.