About this 3D model

I'm currently designing a 3d printed battery grip for the Panasonic GH-1.Due to the complexity of the model,I'm currently starting out with a highly simplified design.This prototype only contains 2 batteries, no button, no electronics, no display, no connectors.Not even routes for the cable. Just holes to mount tiny, 1mm thick copper plates for the battery contacts.It is opened and closed with 3 M5 sinkhole bolts.I want to get this prototype right before refining it into a "proper" battery grip.Blog post:http://marcuswolschon.blogspot.com/2011/07/3d-printed-battery-grip-prototype.html