This is a parts pack that adds a stock alike version of the SLS in 5m size as well as a few Space Shuttle specific parts that will allow you to build the Block I SLS with the complete Orion Spacecraft (CM, SM, and LAS), as well as a full Space Shuttle stack with an External Tank and SRBs that are 5m and 2.25m respectively to be in scale with the Mk3 Spaceplane parts. Note: Delete your old ShadowWorks Install before installing all Updates. Version 2.0.5.1 Waterfall FX Compatibility