It might be easier to make a dark web sersion of this site (.onion) so that we can access it during ddos attacks although I'm not sure whether that would work very well (having two instances of the same software/systems).
.onion is even worse for DDoS attacks because the clients are all anonymous, so you can't ban abusive IPs. That's why I haven't created a .onion, even though it would be very easy to do.
Tor needs to address this somehow. I've mentioned some ideas in the past.