Hi LenS,
Yes those windows are good and lift high to let the air in...
I must admit I don't know if they are double pane... I will look into this...
I guess it would depend on models and prices...
The sky lights are common over here and very popular, some have fans in them too like yours...
I have been thinking and thinking about some of these features for my van... but only thinking
What I would say about the Eurovans is they somehow lack style... I would slap in a couple of windows in the tops at the front "Roadtrek" style to give them a better look... but this is my taste