You are allowed to grief/raid anything that isn't claimed or you can claim over. Beware that your chests and machined will be unlocked if your area gets claimed over by a more powerful faction...
Automatic Crafting Table
Gem and RM Armor
Wireless Redstone (causes a ton of cpu load)
We have tried our best to patch any major bugs that occur to interfere with gameplay (special affects are logged and don't bypass protections, etc.)