I have spent the past couple months working on my machine. I don't know if I could say its original or not, but it has been a learning experience. (I already have plenty of ideas and changes to make on the next build. )
Primary purpose will be to carve patterns and core boxes for metal casting. The primary machine will be 3 axis, but I have thoughts on adding a 4th (A axis rotating around X.)
I am using EMC2 for the software and HobbyCNC Pro 4 axis for the driver and steppers (200 oz-in). Drive screws are 18 TPI all-thread.
http://images.myonlinesite.com/cnc/index.php (Bottom of page has latest updates... links lead to directories with pictures and sometimes flash videos.)
I am running into a bit of mental block coming up with motor mounts and drive nut (threaded rod coupler) attachment. Any thoughts would be welcomed. I have toyed with a few different ideas, and just haven't settled on anything definite yet.
I still have yet to pick out a router for the machine, but have my eye on a couple trim routers.