I just drove it to the sea floor, swam back, and I was only then able to build in one of the 6 places. It is constructed with the Habitat Builder and can only be placed inside a Moonpool. The vehicle upgrade console is built into the wall if the moonpool and there are only six places where it can go.
The Vehicle Upgrade Console displays the name and current Energy level of any docked vehicle. The Vehicle Upgrade Console is a Seabase module that allows the player to upgrade and customize the Seamoth and Prawn Suit. Apparently they have also made a change (or broke it?) Make sure your cursor is pointed at the wall and that you don't have any windows or reinforcements in the way. so that you can not build the Upgrade Console when a SeaMoth is in the bay. In order for the player to build it, its blueprint must be retrieved from a Data Box.