Much as I'd love to see a Hellcat, it is a shame about the open topped turret! Seen pics of M10s and M36s with improvised armoured turret covers which look OK, but never seen one on an M18. Still make a good RC tank (destroyer!) though!
In regards to a Sherman, I've always been curious as to why Tamiya chose to release the 105mm howitzer version and not a normal "Easy Eight". That would have to be my favourite version of the Sherman. A 1/16 one in Battle of the Bulge winter whitewash would look great!!