That's very pretty! You did a great job! I'm going to look for this pattern - I really like it.
Do you think the weight may also come from the drapery fabric? Once I used some leftover drapery fabric and made a lap quilt. It is so heavy that no one ever uses it! I think on mine, the weight comes from the drapery fabric, and also the fact that I used it for both the lining and top, so double the weight for it. I bet I don't do that again :)