The last pic "ultra modern Boeing" is a Boeing 247. It has an interesting combination of features, for it has the reverse-sloping windshield that only the first aircraft of this type had (the mainstream 247D production ones had conventional slope) but it has three-blade constant speed propellers, where the first had two-blade fixed props.
In the Wikipedia article there are a couple of pictures of 247s with both reverse-slope windscreens and three-blade propellors. I know, Wikipedia, but these are photographs. Any chance of retrofits, perhaps?