Thanks for posting your work!
Shermans are a favorite of mine so I know tons of detials. If I may, here are some items I see on your build
1) the DML kit poorly portrays the turret pistol port. Its lip should be smoothed into the turret wall. See here:
www.toadmanstankpictures.com/firefly_07.jpg
Also remove that "handle" you placed on the pistol port's face.
2) the added side hull armor was prescribed in very exact spots (to protect ammo bins behind them). The two plates you have on the right hull side are each too far back. www.toadmanstankpictures.com/sherman_v_m4a4_01.jpg
3) your added plate in front of the asst driver's position has a nasty gap that would be an extreme vulnerable spot. It should look like this: www.toadmanstankpictures.com/firefly_38.jpg
4) the bolt strip between the transmission cover and the glacis plate should look like this: www.toadmanstankpictures.com/m4a4t_38.jpg
I wouldn't suggest you alter these things in your current build. Go ahead and finish it. However, the tons of features of a well known vehicle like the Sherman abound in online photo collections. Feel free to ask if a part or a kit seems weird or strange to you. Best of luck