Still cutting my teeth with sketchup. Here is the hercules extruder in 3D:
The sketchup-svg-outline-plugin is great for producing laser cuts for Ponoko. I recommend this sketch-svg tutorial.
Added the trapped nut cutouts:
This intersect model tutorial was essential for making the trapped nut cutouts.
I just ordered v1 of the extruder from ponoko:
Prometheus Fusion Perfection 
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