The Core Design is complete.
Check out the Outer Ring page for the remaining design changes.
The Outer Ring page finalizes the core design.
Knowledge of physics allows us to apply that knowledge to a theory of operation, which then is what the engineering is based on. Experimentation is different. When experimentation produces results or a discovery, it's not the engineering which is the theory. Without theory, there would be no understanding upon which to apply engineering, and therefore nothing that can be engineered.
The design is complete just as the physics are now, complete. Engineering theory is not an applicable term, because anything that can be conceived can be built, it's just a question of if it will accomplish the objective of the theory, or the reason why it is built.
Theory is not guess-work. Everything in a good theory is based on principles of physics that work demonstratively. So theory is not part of the research phase. Theory is itself, the development of design; the development stage.
Now that the core is complete, after the rigor of research and examination, elements may change but essentially the core principles will remain the same.
New insights and discoveries can be made from the core, perhaps explaining similar mechanisms in very different ways. For example Archimedes tapped the basic fundamental nature of the vibrating universe with his water screw. Pythagoras tapped the basic fundamental nature of the resonating universe with his musical chords and sacred geometry. We can see that same geometry with the sine wave pattern of electromagnetic current spiraling itself along a wire. Einstein noted the rotation and spin of the planets and how it related to gravity; and also he related acceleration fields to gravity fields.
Searle, Carr, Tesla, Hamel, Townsend Brown, Ning Li, and countless others all used the same core.
With the core, anything can be understood that can be derived further.
This is common core warp drive physics.