thanks to both tak2hata & Tig 
I can finally test it, and it seems a plugin with great potential
Google SketchUp Pro 7 (7.0.10248)
Mac OSX 10.4.11, old PPC G4
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🔌 Easy Offset | Offset selected faces in SketchUp in positive and negative offsets. Download
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RE: [Plugin]T2H_BuildingStructureTools2.2.4 in20141207