I haven't read everything but by looking at the pictures it looks like he has a 14x22.5 wheel and an adapter to put it on something with 10 lugs. I would assume he wants to put 445/50R22.5 tires on whatever he is building. He doesn't need acorn nuts. He needs 33mm lug nuts if that is the case. That is the standard of the industry these days. I have buckets full of them laying around. They can be bought at any truck dealer. Even Amazon has them.

https://www.amazon.com/20-Pack-33-Wheel-Nuts/dp/B01G606AGK

If he wants acorns on them, they can be bought at any chrome shop. I have lots of them around. I make the drivers remove them because it is hard to tell of the lug nut is coming loose. And I want my drivers to look professional, not like kids that just fell out of truck driving school. This may be what he is referring to as acorn nuts.

https://zips.com/parts-detail/unite...F-SY7W7bvBmSzfhactVcbx0OJyhoCe-4QAvD_BwE

As far as the adapters being aluminum, if they are quality made there is nothing wrong with them.

Conmet aluminum hubs have logged millions on top of million miles.

https://conmet.com/oem/conmet-proprietary-products/hub-assemblies/