Joining model elements to each other, and excluding elements in design options

Hi all,
I’m very new to using Dynamo but I have a project where I want to join facade panels together for a seamless look. I thought I had gotten somewhere with it but I’m stuck and not making any progress.

Hopefully someone can take a look and get me back on track!

Here is the dyn file and an example of what I want to do!

Join Facade Panels.dyn (62.3 KB)