re: the Sherman. Personally, I think the "basic" M4 is a good starting point. Depending on how FL produces their vehicles these could be produced in batches with variations. As Terry pointed out the first two armored divisions into Normandy (2nd Armored and 3rd Armored) had yellow "buzz numbers" or "call numbers" with the company lettter and the tank's number. The seperate tank battalions didn't often have the numbers or such, but the 70th Tank Battalion used red number with white outlines on D-Day (Utah Beach) on a number of their tanks. Some 70th TB tanks also had the battalion's cartoon mascot painted in the side. As the Normandy campaign went on the numbers were often over painted, so one might see dark OD splotches on the turret. About the time of Operation Cobra the 12th Army Group specificed that tanks should receive a pattern overspray of black paint. With the US Army spread out through Normandy and with many units in contact with the enemy a lot of tanks didn't get painted for Opn Cobra, so period photos show tanks with buzz numbers, plain OD tanks, tanks with painted out stars or numbers and some tanks with black paint over the OD, plus the 7th Armored Division seems to have maintained the full white star markings through the breakout period from viewing British Pathe movie films). That provides several paint schemes just for M4s during the Normandy campaign. One can also add in the hedgerow "choppers" or "rhinos" (several versions) on the nose of some tanks and some units started adding sand bags to the front of the tanks about then. That means the basic M4 can have several variations in color or accessories. Add in the fact that some British units received M4s in addition to their other models, and some of those M4s were converted to "Firefly" 17-pounder tanks. That shows that First Legion chose a good basic model to start with (IMHO). They can produce other variants as sales allow or customers request.
Again, I'm not sure how FL produces their vehicles, but some of the basic M4 components could also be used to produce the M4A1 with its distinctive cast hull. These were the second most common Sherman in US service in Normandy. The running gear could also be applicable to an M4 with 105mm howitzer. These "assault gun" tanks had just started production in the spring of 1944 and some units didn't receive theirs until they were already committed to combat. The other major US Sherman variant in Normandy was the M4A1 76mm Wet Stowage that reached the 2nd and 3rd Armored Divisions in mid-to-late July (but these have been made by Collector's Showcase and Honour Bound).
Gary B.