Thanks for all replies, here is my answers for your questions.
@Nr1madman
1. The steel would be EN 8 to EN 31 plates.
2. Ill got with 100 mm Square poles with 5 or 6 mm thickness
3. Ill go with 20 or 30mm square rails as per your suggestion but will post design soon.
4. I made the design in simple base not fully, but thinking to go with Fixed Gantry.

@routercnc

I think you are saying mill style machine that I believe fixed gantry. CAn I got with Wade O Design?
Someone suggested for moving gantry in CNC zone forums few years back, but they never replied again and never made anything.

Yeah got it what you said yes I am too loking more stiffer than the one I linked, but the design is so easy to process.

I also checked Chaz design but looks it is a fixed gantry. http://www.mycncuk.com/threads/9616-...d-that-be-Zeus
Is this is the machine that you are talking about it?

Let me know whether I should go with Wade O design as it is easier to make and i will modify according to our need.