I am not too concerned about the headliners. While looks are fairly important to me I believe that accessibility will prove more important in an older boat. So, with that said, while I might be handy enough to pull off wood strips of bamboo, I think that my inclination to sand and paint the cabin top white and be done with it.
The interior of the cabin top will be incredibly rough on many boats, mine certainly is. Not impossible to fill and fair but a totally miserable job to do as it will fill the boat with dust even using an extraction system.
Boats with headlinings often run the cables up there too.
However not all boats are rough as the CSYs I looked at had tops that were pretty fair and painted up nicely; one even had 'trompe l'oeil' art work everwhere.