What I would like to know is what programs you use to design in?
Lee, very flattered that you picked the image of my router!

I use the free version of Google Sketchup. Sketchup is a great! It's not engineering software, but you can change the default accuracy from 1mm to 0.01mm which helps. It's amazing for free! :-)

"Components" are the best. Every copy of a component in the model will change when you edit just one of them. Want to add a chamfer to a bearing that appears 50 times in your model? 60seconds of work! :-)

I wrote a free plugin that gives you DXF and STL output from the free version of Sketchup,
Nathan - THANKYOU so much for the sketchup plugin. I was about to start learning to use the emachineshop CAD program to generate dxf files, but no need now! I'll install it and have a play at the weekend...

Cheers!