Wow! This install brings up all sorts of interesting points!
You say that you took the fan down....so, even though I consider that plywood (or is it 1x lumber?) to not be enough support, is seem to have worked out.
I see a box atop the plywood- which raises the question of whether the wood is equivalent to a plastic bushing in protecting the wires from abrasion.
Comparing this to the "old school" method ( a four-square/ mud ring attached to a 2x4, which in turn is screwed to the rafters), I'm not sure it's "wrong;" but it is certainly original!
