Nothing is available because it’s so damn expensive. This isn’t something that can really be a garage hobby, so no one does it as such.
A quick search shows https://www.phoronix.com/news/Google-Open-Silicon-Portal might be worth looking into
Edit: it also needs the wafer, which is another set of machinery that is very pricey.
I was still expecting Sadam Hussein’s hiding spot at the bottom.