Just a quick question. Can a well made CNC machine using servos and a good router, but built from MDF, handle milling Alum?

See, I was thinking of ordering high-quality parts (Servos, Gecko drivers, Ballscrews and Linear Rails) for my machine, but saving some initial cost by building it out of MDF. I have a few reasons for this:

1) MDF is easy to work.
2) MDF is cheap enough that I can tinker with the design.
3) If the MDF machine can cut Alum, I can use it to remake the machine from Alum once my design is final.

So, any thoughts?