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I know a couple living there. Rent, food, utilities, wifi and transportation cost them $450/month

I spent a year in Thailand in the seventies. Other than the fact that a war was in progress it was remarkably enjoyable.
Key question. What's the cambodian government's attitude toward citizens owning and carrying guns?

I have no idea since I don't care for guns. But does the fact that someone just threw a grenade in a street in the capital to 'get revenge' answer your question? :)

nope

Why is it a key question? What influence could that possibly have on the idea of building a peaceful crypto-community?
People are generally peaceful here, and if it looks like Steemit City is about to get invaded we'll flee to international waters :)

Now me, I love guns!

That said, I think that the cambodian government is not going to smile upon your owning one. I could be wrong though, and will do some research.

Absolutely. Life is remarkably cheap and easy here.

Definitely less than a thousand dollars. If you work remotely, you can save $$$$$$$.