Great job! I really like that it is fully reversible, I might do this over the summer.
To clarify, basically those male disconnects get plugged into the relay board instead of the relay, then you plug the relays into the added interlocking sockets, with pin 85 wired to the switch to manually override the fans?
It would be great if there was a way to clean up all the male disconnects, but it doesn't look like anyone makes a male relay plug, unless you want to gut a standard relay.