heidenhains will xost you a knee and a rib new.
Unfortunatly i think you will need to consider what quality DRO you want to use for feedback since a DRO that displays 0.00001" 'does not necessarilly say it is always precise ad repettitive to 0.00001".Heidenhains ARE, most of the time when installed exactly correctly but the cheaper ones sure ain't.
I do believe it's the best feedback a machine can have since an encoder on your motor will only tell how many turns the motor/screw made and calculate theoreticalposition from there while a DRO will "take up all backlash" and only count actually moved distance though i can only guess to much backlash will make it a pita to tune the motors and maybe impossible if it''s not very repeatable.
me no expert by the way so please prove me wrong and i will be the first to steel your design.
Finally CHIPS you can have as much as you can without the doc. complainting about your cholesterol.