How is the weather in lovely Italy?
Mario, first of all we have to discuss what time frame you are talking about.
As Erik had stated correctly M4A3 were not used by the Brits operationally!
Re-configurating an British M4A1, 76-MM, WET would be no problem as the changes were minor.
Due to the fact, that the M4A1, 76-MM, WET had 2-IN bomb thrower mounted in the turret, external bombthrowers were not attached.
Check with pictures in regard to the .50 CAL M2 HB machine gun. Most British Shermans didn't have the .50 cal.
But you have to add the British antenna mounts as the British WS No. 19 hat TWO antennas, one short range and one long range. The British antenna mounts look different compared with the US SCR antenna mounts.
As Erik mentioned you have to add the British bromid fire extingushers.
Just to tell you, that the Italeri M4A1, 76-MM, WET wouldn't be my choice! The 76-MM barrel has this somehow "interesting" step close to the mantlet!! This is not correct!
Compare it with pictures of the M4A1, 76-MM, WET and you will understand what I mean!
The bogies are D47527 Late production bogies with bracket C100823 inclined return roller bracket and are not the preferred choice! I would go with TASCA's bogies, as they are better detailed! The D38501 Spoked Wheel of the Italeri kit were high standard in 1978, when this kit emerged! But for todays standards they are poor as they are lacking the grease nipples!
As Erik stated the M4A1 or Sherman II A, as it was known in British service were used in Italy by the Brits only.
Mario, try to sell your Tamiya kits and the M4A1, 76-MM kit at ebay and go for TASCA Shermans!
The TAMIYA M4s all of them, have surpressed weld beads on the hulls!!! Have you ever seen surpressed weld beads? That's ********! But the same applies for the old DRAGON kits. They too had surpressed weld beads!
Not to discourage you, but I wouldn't waste my time with these old models!