Here is simple plugin to customize 404 page on your Q2A site. Its FREE!
Admin interface
Download
https://github.com/ProThoughts/q2a-custom-404-page
Demo
http://q2a-dev.prothoughts.com/abcde
I have installed this plugin and working fine. I want add here, if someone wants all 404 pages to go to their home page then add this on html code -
<meta HTTP-EQUIV="REFRESH" content="0; url=http://www.yourdomain.com/">
See Demo Here
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