i am trying to create a "sliderline" for lining up active ojects selected by a user

information associated with those objects could be "read" in the order of the selected objects on the line

objects could be added to or removed from the line, and the line should "update" itself by moving the objects together if one is removed

it would be very cool to insert items between existing items

I am calling this a dynamic visual array, if it has a real name or you have an idea about how to do this please check out my example file which sort of works but needs a real solution:
sliderline example file page

thanx for any help