/diy/ - Do It Yourself

Hi, I'm trying to design an open source 3D printer that should be easy to build, doesn't require any 3D printed parts (all custom parts should be make able by cutting plates-plastic or wood) and the other parts should be standard parts (like for CNC) you can easily buy on ebay. I'm as well playing with the idea that you could make the custom parts out of cardboard (since they are so simple) and then print parts that are similar to reprap's.
I tried to put together a first concept in Sketchup, this is how it looks so far, what do you think?