If you want to have a fully parametric roller blinds you can try this Revit Family.
I've created everything to be fully adjustable so you can now fit your roller blinds anywhere you want.
Things you are able to change, you can see in jpgs, like:Height, Width, Depth, Material for everything and more.
It's absolutely easy to change everything you want, so it will fit everywhere according your ideas.
Thank you for your time and i hope you'll like it. :)