The SR-20RII is a good machine, Fanuc control, sturdy and reliable.
That being said...
All X/Y/Z moves are done from the gang slide's point of view rather than a specific tool's point of view...
The turning and milling tools across the gang are easy enough, but Z plus/minus are reversed from a standard turning machine.
The main spindle live tools are located vertically behind the spindle, and they use (in my opinion) a confusing method of programming/offsetting: the X/Y coordinates are based on the *gang slide* movement... to make a hole in the side of the part with a live drill, it is done with Y axis moves.
From the standpoint of an operator, I guess that makes sense... the gang is moving the live tool, therefore it is a Y axis move.
But from a programmer's standpoint, that seems wrong... moves into the OD of a part should be done in the X axis, and the Y axis should be used to adjust the tool to the C/L of the part, no matter what tool is doing the cutting.
I only say that after several years of working with Citizen swiss machines... they have kept the X/Y/Z axis moves a little more standard... X controls movement into and out of the OD of the part, Y controls the off-center location of those moves. You never need to open the door and see where the tool is physically located in the machine in order to figure out which axis controls what.
Just my $.02