SketchUp - ZGMF-X13A Providence Gundam

My latest project was ZGMF-X13A Providence Gundam. After working on it for few days, finally it is done. Unfortunately I cannot upload it into Google 3D Warehouse due to my ZGMF-X13A Providence Gundam model is 16 MB (max 10 MB). Huh! Now I have to reduce the polygons of the model, anyone know how to reduce polygons count via SketchUp? How the new model look like? Please click on the image below.