This looks really dangerous! The whole thing may fall over backwards with it being so much higher off the ground! It looks like you must either bolt it down to the concrete floor or bolt it onto a thick steel plate that spreads out further to the back! & put rubber screw jacked feet at the 4 corners.
We dont have this model but have got used to the Yaxis being the up& down motion. It is really a Horizontal machine, with a vertical attachment, so you have to always imagine you are standing behind the horizontal spindle, then the motion commands of Z- means drilling or milling into a job horizontally Y+ means milling upwards, X+ means milling to the right etc just the same as what you are used to on your vertical machines. I don't think you can change their names. If you program off the machine using a PC you will get all the correct commands swapped &done by the post processor, written will all the axis named correctly, but you will still need to take care each time yu come to work on this machine, to "swap your brain over" with your setting up & manual moves of the table. I was confused at first but did get used to it after a while. You may have to start each program with a line to tell the machine to be in either vertical or horizontal mode for the drilling cycles to work correctly &tool length offsets etc I think G17 &G18 are the ones to look at??? G17 for horizontal working & G18 when you have the vertical head fitted vertical or G19 when you have the vertical head tilted at 90degrees =sideways!