Stell frame cnc 1500X1000. Adjustable table your opinion please

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After so many months of studding the cnc world, i finally realize that that the myth about lightweight gantries ( that i had in mind ) bites the dust. I am talking about my machine and not for every cnc. Thanks to Deans advices and thanks to Jonathan calculator, i see that 20-30 and even more kgr at the gantry weight doesn’t affect torque needs of the motors. I understood that the most torque will be needed to move pulleys and ballscrew than the gantry that slides on the carriages. Also Syliavsky Eddy, and Ger21 mention that. Thank you every one. After that i will make some changes to Y axis and then go on with the Z axis. So far my gantry weights about 65-70 kgr( without the motors ballscrews of y axis and without the Z axis that need to be designed.
A last photo of the gantry



Vagelis