Apparently keeping a planet's atmosphere in a steady state of thermal equilibrium is difficult unless it reaches an extreme of hot like Venus or cold like Pluto. The Earth does have a naturally adjusting carbon sequestration feedback loop, yet ongoing social changes to the naturally correcting thermal equilibrium are much faster than nature can adjust to such that it would keep the ecosphere suitable for human life.
If one made a planet somewhere near a star collecting mass , sending it to a collecting spot and letting gravity compact it, one might need to plan for instability from the heat arriving from a star that would affect whatever atmosphere and surface was designed in addition to intrinsic heat radiated from the planet's interior if one has made it replete with radioactive elements.
It might be worth fabricating a planet with a steady input of elements requisite for human life that won't need to receive heat from a star; at least an advanced civilization building planet-size human habitats might work in that direction. Otherwise the natural course would be inherently unstable or unsuitable for human life without ongoing corrections to the environment.
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