You won't need a reverse proxy in front of #WriteFreely in v0.4 -- now it can handle secure traffic on its own.
https://phabricator.write.as/T537
Going along with this, by v1.0 we'll have built-in support for getting certificates from Let's Encrypt.
https://phabricator.write.as/T542
This instance is only for A Bunch Tell projects.