Stell frame cnc 1500X1000. Adjustable table your opinion please

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Hi Everybody
My name is Vagelis and I am from Greece
I would like your advice and your opinion on the plans below.
Involving a cnc (1500mm x 1000mm) which
will runs with Yaskawa servo 400 watt
Supported profiled rails 20mm, ballscrews X, Y 20mm Z 16mm
Spindle 2,2 KW water cooled

The following plans have to do with the table
I want to make something stiff and adjustable
The main table is made with 80X80 5mm square tube and the X axis rails will be placed on two ( each side ) I beams. The one I beam (120mm height) will be welded on the table and the above will be adjustable up-down left-right with screws. Before i go on with the plans i think that it will be good to get some opinions from the "experts" as i am amateur at cnc constructions ( sory for my english).
My main concern is if I beam is suitable for this purpose, or it is better to go with 120X60 5mm tube
The cutting surface will also be adjustable from the brown L shape angle that can be moved up and down.

Thanks everybody for your time