Piston, rings and cylinder

I want to understand how this works..

I am thinking on replacing piston and rings to my TE250 2011, for the first time ever, she is rock solid, pushing like a tractor, but the engine has about 170 hrs. No smoke, starts inmediately cold or hot, etc, she is perfectly fine and reliable as always.

But, I understand the cylinder is plated with NiCaSil, and the internal measurement does not change and cannot be rectified. So, if I want to change the piston and rings, I assume I just need to use the same parts she came from the factory, right or not?

Questions:
What is the original piston and rings measure from the factory?
What is the piston and rings measurement I need to drop this time?
How many piston/rings I can change before I need to change the cylinder or work the cylinder.
What is the work that needs to be done to cylinder(if any) when I change piston and rings?

Thank you in advance

You will just need original factor sizes. No work to the cylinder unless it is damaged. The cylinder is aluminum coated in a very hard material nicasil. The rings ware out first before the cylinder ever will. You would replate the cylinder if damaged but that is it.
If you are not having any issues the reason you are changing the piston and rings is to avoid them breaking and damaging the cylinder/ leaving you stranded. Pistons and ring fatigue and will break at some point. Know way to know when.

Manual will tell you factory sizes of these parts. Nothing changes unless you re-plate the cylinder.

Have a leak down test done. You may not need anything or you may need more, like valves or guides.