After swapping the stock cooler out for the Noctua L9X65 the temps are around 65-70ish with the CPU and GPU both under full load.
One of the very interesting things I have found is that if you limit the volume of air inside it is much easier to cool overall.
I am working on the second generation of this that will actually do away with the two drives, ssd and mechanical and use and M.2 with a much never CPU. With the elimination of those drives I can add a higher end GPU as well.
This will continue to be a work in progress.