So me and a couple of friends decided that we want to design a 3 Axis cnc router that is able to cut aluminium.

Components i have found, and consider using.
Nema 23 340oz stepper engines (Nema 23 CNC Stepper Motor 2.4Nm(340oz.in) 1.8A 23HS41-1804S - US$)
16mm lead screws, 1000mm, 800mm and 300mm.
12mm linear guide for Y and Z axis, 16mm linear guide for for X axis. (Picture further down of the linear guides i want to use(not going with the ones in the 3D model)
For the frame i have used 50x50mm alu extrusions.

Does anyone have anything to say about the dimensions on the lead screws, linear guides and engines. Basically i wonder if it is strong enough to cut aluminium. And if not, please point me in the direction of some useful info on the subject.

This is the basic design we want. The final design will most likely look a lot different, but this is our starting point.

Dimensions:

The type of linear guide i am considering using.