Installed two Delta Fans for defrost and avionics heat dissipation. Part number is: EFB0512HA. These are 50mm axial fans with brushless motors. RPM is 5,500. Two of these should be plenty. I had to be careful so these don't interfere with the tip up frame and instrument panel.
Marked and match drilled. Need to make some careful cuts.
Spacing should be good.
Outside view. These will get filters and grills covering them.