Wayne, those are aluminum louvers off the bluebird, I modified them a little and I think they look good. At first I was going to tilt the aluminum siding but I had no way to make it look nice like factory Eagle louvers which prompted me to use the louvers off the other bus
I do believe the series 60 needs ventilation, we will see if it runs hotter with the back door on.
I am not making corner doors right now because other things need my attention such as the front door which doesn’t exist right now