A good resource on the conversion would be Jentz' book. He gives a timeline with changes and how they overlap.

Just off the top of my head: the turret roof vents, sights and armor, close proximity weapon, S mines, track hangers, cupola and loaders hatch, anti aircraft MG. Then there are minor barrel and muzzle brake.

Rivetcounter has the best advice, decide what era or even better, an actual tank via photo and go from there. Tigers were constantly evolving depending of development, need and material shortcomings.