Dave R.  was a big inspiration for me.  
He pretty much got me started, and taught me SketchUp. 
He would even call me to help me through problems.  
I use it almost everyday,  it changed how I approach not only building jobs in my shop but bidding and working with customers. 

I owe him a lot.

Figuring out how to do something you have never done is what makes a good challenge.