1. Avian has greater protection though, kind of mitigates that, too lazy to do the math. I have a feeling the reduced attack times give an edge here...
2. Yes, definitively looks good, GA WTs shouldn't be too strong either because of the easy rebuild (although most of the stealth would get burned on the same tick anyway against anyone decent), problem I have here is I don't think thieves are that strong this age to need extra protection against.
3. Don't know, guess so.
4. What you call blocking is actually what allowed you to set up these banks imo, warring these days is so good, no science build up time lost and you get to shift acres onto big provs then whore the smaller ones post war.