Don't spend time with the "Super Sherman", it's the worst Tamiya model. I spent 10 years studying Shermans tanks and built several 1/16 versions of the IDF and you must to be prepared to spend a lot of money and effort.
By the other hand a M26 Pershing built out of the box is a very accurate model and have all the functions including brake lights...etc.

Check these links as reference
http://www.modelersite.com/en/2040/b...kit-1-16-scale ( two tanks M51 in one tutorial, welded and cast hull)

http://www.modelersite.com/en/2048/b...man-1-16-scale ( very modified Tamiya M4 to get an M50)