I am interested in building a CNC router mainly to cut non ferrous metals with
a table size of about 3 foot by 6 foot.Can anyone help me with plans for the mechanics and the electronics

I haven't seen any plans for a machine that large that's capable of cutting metals. The only thing that comes to mind is the data-cut, www.data-cut.com , but I'm not sure if it's strong enough.

Ok thanks Gerry I had a look at the data cut router website but I am still looking
to build a bigger cnc router that a full sheet of aluminium (1250mm x 2500mm) can fit on.I found a web site about CNC router parts and plans will probably get them there.