The answer to this question will probably depend in part on the payload capacity available.Would they directly install the docking ports on Node 4 or would they install a full ACBM and then attach an adapter? The advantage of the ACBM/adapter being that they can re-arrange the docking ports on-orbit if they need to, or replace them with another system down the road (as APAS/PMA is about to be replaced).
To be clear, is this the same unit as "Node X" at MSFC, or another unit?