The base model would have to have $12k of materials for the same ratio. I don't think that's likely (since much of it's invariant and especially since the $54k figure includes the Autopilot upgrade, which is only software) but it will have 1/3 less battery, which is a decent part of the cost of the car. So the base model will probably not be as profitable, but I think that's true for most cars.
Porche makes $17k/car... but that's on an average price of $100k.. so only 17%[1].
0. https://www.detroitnews.com/story/business/autos/2015/02/22/...
1. https://www.autoblog.com/2017/03/21/porsche-17250-profit-per...
And trying to meet that target before technology allows them to is what is driving Tesla's current financial problems.