Like I said in the post above I am new to the world of cnc myself but from reading the build logs & general help from members on the forum I don't think you will be able to do much of what you want to with the machine as it stands.
If I were you I would spend a bit of time reading some of the build threads & asking questions before you go buying any electronics. Like I say I am not an expert but I doubt if it will cut ally very well at all, acrylic you will need some kind of spindle speed control because DIY router speeds are to fast to cut acrylic & it just melts back together. I would think your motors are a bit on the week side for what you want to cut.

One thing I have learnt is that there is a lot more to this than buying the book & building the machine, especially if you want to use it for business use.