Yes grousers are there for better ground cover in snow / sand, makes sense.

I read some more and the above pictured "davey jones" has something interesting.. nails welded around the hatches to keep prying infantry hands away. Amazing.



One rule of r/c tanking... if you can think up a Sherman, someone has done it! That being said I like what you've done and I haven't yet seen any wooden sided Shermans.