So, having bought this way back at Salute (this year I do point out), it has reached my workbench.
This is a four sprue kit in the slightly larger Rubicon box.
Sprue A is the standard lower hull and Vertical Volute suspension
Sprue B has the M4A3 hull and accessories.
Sprue D has the T23 76mm turret and the extended edge connectors track.
Sprue E is the Horizontal Volute Suspension
Instructions and decal sheet.
So far I have assembled the basic structure of the turret.
William Killian for scale.