I like "C11", III.Panzer Regiment GD from the TIF site. It would be a good candidate for your first try at converting the Tamiya Tiger I kit to a Mid-Production Tiger I. You wouldn't need to change the wheels of the kit to steel wheels as "C11" has the rubber tire wheels. The turret has the low profile commanders cupola and the track hanger on it as well. Wouldn't need to add the thicker armor to the turret roof either. I am sure rivetcounter can add more to what needs to be done, but this would be an easy first conversion for you to try and would give you the late Tiger I look.