Ok, I more or less agree with you here. A car is not a fundamental object, it's composed of many layers of constituent objects which eventually resolve down to fundamental particles and forces. And if physicalism is true, then consciousness also is not fundamental, but ultimately resolves down to fundamental particles and forces also.

I don't know whether physicalism is true. It certainly seems like the best overall account of the universe that we currently have, but if there is a chink in physicalism's armor, consciousness might be it. Might. But, you're right, there's a huge leap between "might" and "is".