"In reality the thrust architecture might resemble a large Ferris Wheel when the covering is removed which indicates the possibility of more than four engines".

The world's largest Ferris Wheel is scheduled for a height of a 62 story building (Click here) although the Thrust Structure is envisioned to be considerably less in height and determined by various engineering analysis.

To minimize the need for extensive scaffolding, a second suggested assembly approach might be add-a section, rotate, add-a-section, rotate add-a-section rotate until the complete unit is complete.

Given that Reaction Engines weigh tons, this over simplification is for illustrative purposes only assuming a material of sufficient strength

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