Yes, it's just an oak vaneer plywood that I picked up at my local HD.
As far as building another set of doors out of better wood...yes it would look better and maybe someday but not high on my list of priorities. I just wanted something that looked halfway decent and get rid of the slats.
Regarding the lack of ventilation, the reason I built them is to use mostly when at dock and the AC is running. We're in and out of the boat a lot, and putting in and taking out the slats numerous times is a real pain in the butt. So ventilation is not what I wanted.