i don’t know if your blueprint logic is correct but when trying to build something complex inside unreal try figuring out if the basic steps are executed correctly
so first try to show only one mesh, if that works then try to show the meshes from an array (you can place them all of them in the level see if that works)
it works? if yes move to the timer logic. see if that works by itself, print a message to the screen every second, or “frame”
that works? if yes, then try to combine all the above