Iphone case: base model

Hi There,

I want to try out 3D Printing making a custom Iphone case for a friend. I do have some experience with 3D Modeling, but not printing. So here's my problem: I don't have an Iphone lying around to take basic measurements and se where to cut holes etc.

Where could i get a "basic" case model that regards the Iphones dimensions and buttons to start from?

The basic basics can be found here http://www.apple.com/iphone/iphone-4/specs.html

thank you, i think that gives me a starting point.

i also used this information to make my iphone cases,
see my shop 3D4all

https://www.shapeways.com/shops/3d4all

Here's some very detailed dimensioned images.
http://www.core77.com/blog/object_culture/cool_actual_iphone _4_cad_drawings_17017.asp

fantastic, thank you!