This was started a long time ago but looks like you're still active - your Index is a 756, same as mine. Like a 745 without the overarm ram or ability to 'nod' the head, details and options can be seen in Index's assembly drawings in the 745 manual. I'm guessing these changes offered more rigidity at the expense of some travel.
I like the table feed option in both axes, wish mine had that.
I like the table feed option in both axes, wish mine had that.