After reviewing the projects on this forum, at the moment I will probably choose a version similar to the project made by 'devmonkey' ("Joe's 1000x600x200 steel and aluminium router started"): extrusion gantry and welded steel frame

I started to draw from the Z and Y axes, and I have such a concept:

Click image for larger version.  Name: c01.png  Views: 219  Size: 172.3 KB  ID: 29251

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Click image for larger version.  Name: c03.png  Views: 206  Size: 28.6 KB  ID: 29253

I am still thinking about mounting Y linear rails: as I drew in the picture or maybe I should move them to top and bottom?