I have 4 sets of windows in my kitchen. 3 sets are casement, 1 set is a bay with 1 fixed and 2 double hung. I want to make faux relaxed roman shades for all of them. Faux as in they don't actually raise and lower like blinds. How do I determine how much they should drop in the middle since they are different dimensions? I want it to look uniform, but I'm not sure if it is possible? the center bay may not get one since I have the stained glass there.