You're going to have so much room to 'scape in that; it'll be great. Any ideas on rockwork yet? As for the overflow, are you considering some sort of grating/guard so you don't get any critters in there?
As for SketchUp: if you go to File-->3D Warehouse, you can do a search for models that you can import. A search for PVC plumbing yielded some promising results.
Graeme
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