Visualize car data with Brunel and Scala

There is a sample in IBM Data Science Experience "Visualize car data with Brunel". But this sample notebook is written in Python, PySpark. So I transformed it to Scala just receiving the same result but using Scala syntax. I added some comments to explain the code.
The result is published here.
To run it:

• Download Cars+.ipynb notebook
• Upload to Jupyter with Apache Toree-Scala (Spark) kernel enabled
• Enjoy