Hi Val, also here is a script you can set up on a shortcut key to make it a bit easier to set an object to "wireframe mode": 
 
script: /* Set selected object to wireframe */ var breps = moi.geometryDatabase.getSelectedObjects().getBreps(); for ( var i = 0; i < breps.length; ++i ) breps.item(i).getFaces().setProperty( 'hidden', true ); moi.ui.redrawViewports(); 
 
To set this up, go to Options> Shortcut keys, and add in a new entry. Put in whatever you want for the key to trigger it, like maybe W for wireframe, and for the command part paste in the above. 
 
Then with that in place, you can select some objects, and push W to hide their faces and leave their edges showing, turning just those objects into wireframe mode. 
 
When you want to see the whole object again later, just use Edit > Hide to show the hidden faces. 
 
    - Michael 
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