CNC Circuit Mill Structure Concept- Constructive Criticism Please

[Yoonseo Kang]

I'm developing a CNC Circuit Mill with OSE- would appreciate feedback
on my simple 3D model for prototype 2.

Initially took pointers from Snaplock:
http://mtm.cba.mit.edu/machines/mtm_snap-lock/

This was prototype 1 completed:
http://blog.opensourceecology.org/2012/02/cnc-circuit-mill-prototype-1-complete/

Now this is what I'm thinking of making, but I might have missed
critical points:
http://opensourceecology.org/wiki/CNCCMV2#CAD

Thanks in advance, I appreciate all your help!