Don, my knolage of Tigers is only small there are people out there who have vastly more knolage.

Sax, as you say the sprocket hubs where cast obviously the runs for the sprockets would be machined as would the inside this would be mainly for clearance of final drive cover, the centre would also be machined the rest would be left in a raw cast finish save for the pour plug marks.

All Tigers had there turrets made at Krupp the horse shoe shape was stamped from one large flat sheet the right side protruded more than the left to give the asymmetrical shape, there where no modifications to the turret other than the 40mm turret roof and internal details, the initial Tigers a small number had no escape hatch and twin pistol ports