Based on a discussion on the Exploder I decided to provide a sample on how to leverage BMX to check wall thickness of a part.
The C/E Pro 5.0 (WF 5.0 M050) file is attached.
The key is to issolate the surfaces from the model you wish to measure (i.e. inside to outside). Next leverage field points, analysis features and User defined analysis to solve the measurements around the entire "field".
Hope this helps
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Here are images of 2D, 2D at section and 3D thickness analysis.
used various methods like Ray, Circle and Sphere methods for thickness calcuation.
Most importat function use search thin and thick areas - you can provide ranges and limits!
Creo Rocks! 
you could try downloading free trial at www.geomcaliper.com
