Star Killers Death Stars And Other Worldcraft

Yes It Possible To Build A Planet Sized Vehicle But Such A Project Would Not Be Logical And Here's Why
The Star Killer Base Is The Largest So We'll Use That As An Example

Field Propulsion Could Enable A Star Killer Base To Be Mobile Via A Diesel Engine The Size of It's Core

This Means A Star Killer Base Would Need At Least 280.000 Manual Transmission Gears To Achieve The Field Strength Needed To Move Through Interstellar Space It Would Take 10.000 Pilots Working Together Just To Change Gears That's Why A Star Killer Base or A Death Star or Other Worldcraft Are Too Big For Any Practical Use Outside Entertainment And Star Wars The Force Awakens Did Get It 100% Right Obstructing Destroying or Anyway Damaging The Exhaust Shaft;Would Cause That Big Diesel Engine To Stall That Would Be Bad News Because Without Power There's No Field Strength And The Star Killer Base Would Become One Big Hazard And Ruin Someone's Day Somewhere At Some Point In Time

Such A Project Would Be More of A Hazard Then A Means To An End And Thus Star Killers Are Not Logical