Are you using a Macbook? I've had many problems with Sketchup and Layout crashing on my Macbook.

Wow that's nice, I like that the bolts are textured and colored so the details are idiot proof. These days you need to make everything as clear as possible because assuming people know what they are doing can be a big and costly mistake. A person experienced in layout can really make a job go much more smoothly and save money too. Those drawings with the bolt details is a perfect example. Thanks for posting it.