I know at soem point there will be new windows but there are 10 so it is not a cheap upgrade. Since they dont all leak I will try to get another few years. I agree there are many things about this install that is questionable, slope, height of curb etc. I believe it is not actualy on a curb but a deck mount shimed to fit on the curve hence the low profile. I am curious how this model of window should look, if there is a peice missing or what. I would like to see a brochure or picture of one installed or just what comes with the original window - baically any clues as too how this should look if installed per Velux instructions. I have email Velux to see if they will give me any clues, unfortunately i cant find any legacy data on their site. Anyway thanks, if anyone out there has a deck mount VS4 or VS6 that I can see a picture it would help I think.