I just found a new iPhone app I thought people might could make use of. It's called iGeoLog, and it allows you to build cutaways and make notes in just a few minutes. You can also use location services to mark the exact spot the log was built. The app allows you to email and save the logs. Great tool if you ask me.
Here's a very simple example that I just made up to illustrate.....you can change the dimensions and contours to whatever fits your needs.