ur entire system as we move closer to the planet's outer core. Using Earth as an example, that's a 2,890 km (1,800 mi) overhead we have to deal with.
The composition of the mantle is locally a solid, but essentially a fluid over time. And its temperature (using Earth as an example) can range from between 500 to 900 °C (932 to 1,652 °F) at the upper boundary with the crust; to over 4,000 °C (7,230 °F) at the boundary with the core. [shameless copy pasted from Wiki]
Can we provide an anchoring solution strong enough to withstand the heat and pressure of geological time?
I think so, in the present moment we have (predicted) Hafnium Carbide superalloys with of melting points of about 7,460 degrees Fahrenheit:
And Hafnium superalloys are already known to be excellent an neutron moderators, to shield us from the neutrons produced from nuclear reactions in the planet.
Scientists are already pursuing Hafnium Carbide aerogels!
Having strong, porous materials along with an abundance of atmospheric gases can allow us to making floating platforms which withstand the large pressures from above. Technology like this also already exists:
In conclusion, by simultaneously constructing a planetary spring/storage system, a geothermal/nuclear energy system, and all the other planetary scale systems you'd need included, you could satisfy all of the requirements of creating a traveling planet which could sustain its own needs and survive the internal and external forces of traveling intergalactic space :)