The original question was about where to find the station (aka Leo's workshop). You're already in the Station. The rough gist is that there are 2 power cores you need to restore the station's power. I believe I've written about the power core locations, as well as where to insert them, and the locations of key cards (at the moment only the white one is needed) in various previous posts.
The process is roughly like this (to the best of my memory):
To answer your question, those parts are for an Android called Unit 01. As far as I know, 4/6 is as many parts as you can get and there is nothing you can do to complete that since version 0.3.5.4.2. It's one of many loose ends that may or may not ever get tied up
Personally, I'm on 0.3.5.4.2 in the server room, waiting to make the Blue card and finish this questline (which was promised to be in the next update and hasn't happened yet 2 updates later). Until that happens I will probably not touch this game because I know that I'm going to forget where to go. If the developer continues to mindlessly add new content without finishing up any of the unfinished stuff, I'll strongly consider deleting this game all together.