The project has been cancelled.
The Atlas Space Vessel (Navicomp: ASV) is a space vessel currently being built. It will contain some Linked Ion Drives in the hope of being movable without the engines of the Shuttle. It is planned to be an interplanetary explorer ship.
The builder tug shown in the screenshot in the gallery below is for construction help if a problem happens (e.g. Tug Module runs out of fuel).
The ASC (ASV Construction Site) waypoint is the waypoint that ASV is currently being built. The ASV will be useful until the Transponder is attached.