I am working on a simple plugin that can costumize the 404 error pages -
You can grab it here - https://github.com/amiyasahu/q2a-custom-404-page
Important Note - This is a fork of q2a-custom-404-page made by @ProThoughts (http://www.question2answer.org/qa/36372/)
I have added few more things like searchbox and costum css stylings .
Thanks to @ProThoughts
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Dec 1, 2018: Q2A 1.8.1 released!