Lots of pictures on Google .Sorry can't post pictures , my teenager moved out . Tank hatch usually body color , with the odd one in white . That exhaust on the rear curved plate is a convoy / brake light , red in color
Good website for KV model tips is http;//www.4bogreen.com/

Yeah, the hatch should be the same color as the rest of the tank, with white around the rim of the opening on the tank roof.




These should help:

http://data3.primeportal.net/tanks/dmitry_kiyatkin/kv-1/images/kv-1_073_of_130.jpg

http://data3.primeportal.net/tanks/dmitry_kiyatkin/kv-1/images/kv-1_074_of_130.jpg

http://data3.primeportal.net/tanks/dmitry_kiyatkin/kv-1/images/kv-1_075_of_130.jpg

http://data3.primeportal.net/tanks/dmitry_kiyatkin/kv-1/images/kv-1_117_of_130.jpg

http://data3.primeportal.net/tanks/dmitry_kiyatkin/kv-1/images/kv-1_115_of_130.jpg

Not from a KV-1B, but they should still be useful. Bunch more pics at : http://www.primeportal.net/tanks/dmitry_kiyatkin/kv-1/index.php?Page=1

Hatch is all green on inside. Yes rust the exhausts and I would remove the spare track mounting brackets. Some useful pics here:

http://www.armchairgeneral.com/rkkaww2/galleries/KV_1scr.htm

HTH
Andy