@NanoRaptor
#SciFi : Ken Macleod's Learning the World with the advancing wave of green stars points up the idea that the Dyson sphere is less a solid structure than an accumulation of habitats, machines etc.
(Sphere might not be the shape either)
Larry #Niven's #NeutronStar short story points up one problem of near-point masses, tidal forces. One's personal #RocheLimit is best avoided.
Niven again, and the #SmokeRing and #IntegralTrees is interesting wrt a neutron star and habitability.