You can get the Automatic Model SIZE with B&W Softwares's SMARTAnalysis.
All you need to do is, Prepare your model and open SMARTAnalysis then just regenerate the model.
SMARTAnalysis will prepare a Paramater in [BUW_MDL_SIZE]each part.
Take it into BOM, you'll get the the Model Outline SIZE of each part.
The Intelligence with this Software is, It can differentiate Circular and Non-Circular Parts.
For Circular Parts you'll get Ø D x L
For Non-Circular Parts you'll get L x B x H
If you need more Information, Please contact me @ niru.satya@gmail.com& vniran@softcell.com