The Z-2J is the most powerful engine ive ever designed In Juno, and will be completed shortly after test runs, The Z-2J engine is for the eventual SSTO spaceplane, as very kindly requested by BeaconIndustries, development on my projects typically takes around 2 - 4 weeks or even months, depending on the level of detail i think will be required, for such a project as this one paper concept ideas need to be drawn, and have been with a design i drew a year ago being most likely to follow all requirements.
a powerful engine/scramjet system is actively being designed using multiple configuration ideas. Expect an engine upload later on.
Thanks to BeaconIndustries for providing this project idea
Good job