MR models makes a great Fisher Corp. M4A2 with the fabricated/welded driver's hood. It is supposed to be a conversion to be used with the ESCI/Italeri M4A1 lower hull but I think it could also be used with the Trumpeter, UM or the DML 1/72 M4 kits with some cutting and putty. In fact I would recommend the Trumpter or DML kit for the conversion work over the old ESCI kit.
I am working on the DML M4A2 Tarawa kit myself these past weeks. It is a great kit and among DML's best 1/72 scale models, careful with assebling the bogies though. Below are some links for those interested in the vehicle.