I am creating a Blinds family to do a rendering for a popular window covering company and I am having a hard time getting everything to flex right. 

2 questions:

I can get the blind to flex horizontally just fine until I make it an array. Once it is an array the constraints are not satisfied.

Can I get a tip on how to write a formula to have the base of the blind flex with the bottom part of the shade array?

I have attached the working file if this helps.