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Al is a major element in the solar system. Most rocks have Al2O3 on the order of 3-10 wt.%. That includes chondrites (the major class of meteorite) which have plenty of feldspar, a mineral that’s like 20 wt.% Al2O3, and calcium-aluminium inclusions (CAIs), which are as their name suggests, Al-rich.
When you build new things they necessarily blow up during the development process. NASA is hobbled by a flat budget so they can’t afford to blow anything up. So they can’t build anything new, which is why SLS is a bunch of old parts scrapped together.