The Rocket Launch Platform is part of an in-development vehicle, it will be used to leave Planet 4546B. It can be constructed from the Mobile Vehicle Bay, however it is not advisable to build it during its development stage.
The Rocket Launch Platform is a very large floating barge with ladders on each side. In the middle is a circular indentation where the rocket will sit. On one side will be a terminal used to fabricate the rocket itself, as well as rename and color the rocket. On the opposite side is the rocket gantry (when it is constructed), which has an elevator that will lift the player into the rocket.
The Rocket Launch Platform will be crafted using an Ion Crystal Matrix.
For more information, please visit this Trello page.