Can you give any averages though? For example, how powerful would a character with a 10 in every stat be? A 100? It's hard to do status based design without a basis to work off of.

In your summary, you mentioned a 25 STR iron sword. Is that the normal requirements for it, or will there also be 7 STR and 65 STR variants?

We need a baseline for what could be refered to as "normal" here.