Frakked. *sigh*
Stone is a perfectly viable wall type. You can defend your claim with ONLY stone walls and braziers and 99% of the people will leave you alone.
Torch posts are not affected by purity.
I honestly suggest not putting a brick around your whole claim at all unless you're a big player who's pissed someone off. You might put a little one around your mine or other most valuable things. Or your whole claim, if that's what you want, but you don't Need to.
A bell cannot be eminent domained.
Staggering your gates and making an 'ugly', difficult to navigate base is of little usefulness and will give you a horrible headache living in your base. Remember defense, yes, but also remember you have to live there. Most of what Frakked is talking about with his 'design it ugly' speal is for raider bases. People who have enemies.
Keep your more valuable things in a cupboard in a locked house, perhaps with a dedicated wall around it, for best effect. Mines are convenient for mass storage, but they can't be claimed inside so no crimes are committed when people manage to get inside to rifle through your stuff.