does the construction site progression inherit the Quality of the original Site Item?

Now it does

I have a silo at construction phase 2 of quality rare, but the items it needs, like steel are normal quality. I guess the topic starter asked for this support?

No. We are talking about the entity, not the materials needed

Ah, okay. Should I make another topic? Because I would expect it that a rare-quality silo may need rare-quality ingredients.

This is still not fixed. A rare-quality construction site yields a rare-quality silo already but still normal-quality ingredients are requested for phase 2-6. and only normal-quality stone/ores are being yield. Idea:

• yield stone/ores with lower chances on higher quality
• quality modules are allowed to raise quality yield