Thank you for all of the comments and suggestions, I have been reading up on build logs on both this forum and CNCZONE and only now am starting to understand the scale of the machine required to meet my manufacturing requirements and reading your comments/advice further confirmed this.

I will continue reading and researching CNC builds to gain a better understanding of what I need to do but would appreciate it if you could guide me on what is a "doable first build" so that I can base my research accordingly, I mean machining aluminium would be more than perfect for both my extrusion dies and so much more! but is this a practical goal for a first build?

I also learnt from your comments and other forum posts that with DIY CNC machines, cheap is BAD!!! But just to get a sort of indication of how much this build would cost me (machining aluminium) could you please let me know how much everything other than the frame (which I will be building myself) would be as an estimate (ie, steppers, drivers, power supplies, etc)?