Gday Ed...
Well you have wandered onto a good Sherman kit here..
This was the first incarnation of the M4a1 with the new turret T23 and a 76mm guntube... The 'a1' refers to the one-piece cast (curved) hulled Sherman. You will note the large angled drivers hatches, which were remodelled for ease of escape for the crew... They came ashore in July '44 in preparation for Operation Cobra, which was the breakout from the bocage (hedgerows) pushing south from the beaches and Cotentin peninsula... Initially they weren't liked, but found to be better once they engaged Panthers...! Other operations would be from Op. Cobra right through to the taking of Berlin, including the Ardennes offensive. There were some later alterations including a muzzle brake etc.Not sure they were used in the MTO Italy though...
As for the kit, it is quite accurate although you may want to rough up the casting a little more on the hull sides and the turret sides... There are 2 fuel filler caps tucked in next to the large rectangular cover under the turret rear overhang.(inside the bullet splash ring) they are to be removed for accuracy, leaving 2 on the left and 1 on the right, and one out on the engine cover... (Be careful of the rivets!)
T-48 tracks were used (the rubber chevron style) and either the stamped or spoked rear idler wheel...
Other issues are common faults to most of the plastic kits on the market, but it depends on how accurate you wanna be
Hope this helps, and welcome to Sherman world!
Cheers
Brad