Blackout XenForo Temporarily?

I was curious if anyone would know the best way to "blackout" a XenForo installation for the protest tomorrow? I've heard talk about 503 HTTP header; how would this work with XenForo and is there anything else to consider? We plan on using this page during the blackout: http://www.zachstronaut.com/lab/text-shadow-box/stop-sopa.html

Any tips are much appreciated.

 

A 301? Would that have a negative effect?

 

Do a 302 for temporarily moved.

 

Thanks. Worked perfectly.