This is a 3 part video series.  

Part 1
https://www.youtube.com/watch?v=0gSJnry3ufk

Part 2
https://www.youtube.com/watch?v=p_bjVyw8U9s

Part 3
https://www.youtube.com/watch?v=bCmU17EoNvM

Here is the sketchup file as well if you are interested.