Rescale Collision plane to fit grid size

Hi there,

i’m trying to learn Blueprint scripting and suddenly hit a wall , all i was doing is following a tutorial step by step and i verified that i’m not missing anything but still can’t get the same results:( ,

all i want is to make the collision plane (white plane in picture below) able to rescale automatically and appropriately whenever i change the grid size (blue tiles in picture) which is formed using floor tiles 200*200 and the grid size is determined by “Grid size X” and “Grid size Y” variables in the rescale function (shown in picture below)…in picture below the function responsible for rescaling the collision plane to fit the grid and the grid bp in viewport.

Thank you for your support :).