I wanted a Sherman that I could convert easily from Medium to Heavy.  

 Started with standard Tamyia M4 kit

Lower Hull Mods:

Changed stock motors to 480

Rubber sealed bearings

Daryl Turners Sherman Idler upgrade.

Deans Antenna

6 second servo delay module to slow gun elevation down.  

 M4A3E2 Upper Hull Mods: 

Schmo 75mm metal barrel, Jumbo Turret by Bob Stull (Thanks Bob!)

 Added 9mm styrene to hull sides and front  

Fitted Pershing engine grills into rear deck.  

Futaba 3110 micro servo for elevation.  

Mikes Hobbies 105mm metal barrel

Futaba 3110 micro servo for elevation.