FWIW, my small (25 employee) family business uses ~90,000 lbs of flat sheet galvanized .0356" steel a week. It is similar to what is used in the auto industry. The product we manufacture is ~80% steel. On Wednesday we purchased flat sheet at ~$27.00 sheet, on Thursday we paid ~$34.00 a sheet. The mills are not waiting to see if the tariffs go into affect. We had to immediately raise our prices 4% just to cover costs.
Not sure the percentage of steel in a Model 3, but lets say it's 25%, that would equate to ~1% price increase to cover cost. Or a 1% cut off the bottom line.
In 25 years of running this business it is the only time anything like this has ever happened. During the Bush tariffs we had similar increases, however at a slower pace, something like a 6 months. Our steel cost literally jumped 25% in 12 hours.