How to build a dynamic dashboard based on Security Groups?

I really want to understand and start using Assemblies, but every time I begin working with them, I run into gaps in my knowledge that block me, and I end up going back to the traditional approach.

Could you show us how to build a dynamic dashboard based on Security Groups? The idea would be to use the same dashboard, but dynamically change a few components, such as Combo Boxes and Cube Views, depending on the user's Security Group.

Also, I recently tried to use an Assembly to calculate and display in a Cube View the variance between two scenarios, based on the scenarios selected in Combo Boxes. I ended up building it using the traditional XFBR approach, but I would like to understand how this could be done using Assemblies instead.