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Here's what makes Carbon Nanotubes so impressive:
Carbon Nanotubes have a "tensile strength" σ of about 60 Giga-Pascals
That's 60,000 Newtons per square 𝑚𝑖𝑙𝑙𝑖𝑚𝑒𝑡𝑒𝑟
For reference, an 
weighs about 20,000 Newtonspic.twitter.com/oJJji9CozA
Engineering Difficulties of CNT:
Most nanotubes are constructed with a cross sectional area of about 1nm²
This yields the max. applied force of ~ 10⁻⁸ N
Therefore, the main engineering difficulty is constructing "large scale" Carbon Nanotubes
“If the slice was so thin you couldn’t see it, how did you know you cut it?”
Over a kilometer of multiwalled CNT yarn in my palm. These are not pure enough to build a spacelevator with, for that the engineerds are crying for singlewall CNT yarn. Wish I could be back at it with @mlaine or .@ISECdotORG...Controlled ascent and decent of multiton payloads.pic.twitter.com/fJl15wd3jw
Super toxic to inhale, though
It could be fun to model that with all the brownian motion and other nonlinearities
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