Sorry there's not much in the way of answers here, this game got picked up by Button Shy, so I've been answering most questions in the legends-of-dsyx channel on their Discord: https://discord.gg/GGgupT
1. Statues are worth 1 point per statue. So if you have 3 statues, they'll be worth 3 points each for 9 total.
2. I'm pretty sure this is every turn.
4. The point is that you have to make use of the gold you have before the end of the game, either building things or adjusting rolls.
5. This is pretty common feedback, but it's been a heck of a time gathering information to figure out averages. You'll find plenty of other players on the Button Shy server though.
I hope that helps!