Ah OK, I am going to ask quote now and the immediately order, since I do believe the measurements of these pieces are interesting for making the frame, so it best in my opinion just to buy them
Today mu 1.4m THK linear slide arrived and it is running smooth as butter.
So I now have my 2 750mm THK slides for the Y axis and 1 1400mm THK slide for the X axis.
Next step is the 35x35 and 45x90 alu extrusions and then the cnc will have work to do.
I'll also order now the 3.1Nm nema23 stepper and aluminium pulleys + T5 belt.
Life is good!