Looking up into the rafters of High Bay 3. Click the image to view at a larger resolution. Image source: NASA.
Just when the Space Launch System will launch is anyone's guess, but this image released April 20 by NASA shows the SLS platforms installed so far in the Vehicle Assembly Building's High Bay 3.
A view from below in High Bay 3 inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida, shows three work platforms installed for NASA’s Space Launch System (SLS) rocket. The lower platforms are the K-level work platforms. Above them are the J-level work platforms. A crane is lowering the second half of the J-level platforms for installation about 112 feet above the floor, or nearly 11 stories high.
The newly installed platform will complete the second of 10 levels of work platforms that will surround and provide access to the SLS rocket and Orion spacecraft for Exploration Mission 1. The Ground Systems Development and Operations Program is overseeing upgrades and modifications to VAB High Bay 3, including installation of the new work platforms, to prepare for NASA’s journey to Mars.