John - still looking for the turret bits and pieces you would need for this build. It's a lot easier for me having a large stock of spare parts laying around. But I don't think you want to purchase 2 or 3 Sherman kits to get the necessary extras.
The Tamiya kit should be readily available through your LHS or on-line from Military Hobbies. Here's their link. http://www.militaryhobbies.ca/
Jim - from the front, most welded hull Shermans look close to being the same. It's one of the hardest angles to tell which is which from.
The easiest way to tell is to see the engine deck. From that it is fairly easy to tell one from the other. Now in this case, the 3 pics supplied do not show the engine deck, so you have to use other identifiers to tell which is what.
Looking at the first picture, this could be any early version of the M4, M4A2, M4A3, or M4A4. But by looking at the suspension, there is very little distance between the road wheel sets, so that eliminates the M4A4 which had an extended hull.
From pic 2, the shape of the rear upper hull plate eliminates it being an M4.
So we're down to either an M4A2 of an M4A3.
From pic 2 you can barely see the exhaust under the rear overhang .... definitely an M4A2 exhaust.
Combine that with the M4A3 early being rare, not used by the Canadians, having another 6 or 8 pics of "Bomb" from various angles, etc, etc. ... leads to the I.D.
HTH
Happy Modelling and God Bless
Robert