Thinking of making a DIY cnc

[Wildmine]

Hi, i have been interested in making a cnc for a few years now, but as i am fairly new to the "subject" i am looking for some tips.

I have made a machine before, but as i finished i figured i wanted something stronger. It was made out of 12mm rods and i used 8mm metric threaded rods, so not exactly the strongest, but worked ok for some acrylic.

Now i am interested in upgrading to be able to cut atleast aluminium, and i want to upgrade the size of it.(previous one was 50x50cm total with a cutting area of about 30x30) I was thinking of making a 100x60cm machine and i am looking at these components(ebay collection): CNC parts collection on eBay! .

I already have the nema 23 motors from my previous machine, and i am planning to use them for this one.
Should i go with those SBR20 linear slide rails? Have heard mixed opinions about chinese ones. If you have any suggestions for changes, please come with them.

This is the design i am thinking of making(sketch up):
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I am planning to use 4080, 40120 aluminium profiles and 6082 aluminium plates. RED=15mm BLUE=10mm. (Side plates are 500mm).

Suggestions are appreciated

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