Any way to make minor scenery correction yourself?

I have some (limited) 3D modeling experience and was wondering if it’s possible to make scenery changes myself by importing/exporting files. Specifically, I was flying into a small corporate airport (KFTY) in Atlanta and there was a runway that’s no longer there (9L/27R) and a wind sock right in the middle of a taxiway that I’d like to correct. I was directed to land on that runway, so I’d also like to remove it from whatever database that has the runway still active. I would also like to add simple hangars and other buildings to the airports I frequent.

Thanks,

Jay