One problem with the Warlord Ch-Ha tank is that there is almost enough parts for both turrets, except the rear of the turret machine gun and the commander's cupola.
Now a contributor to the Rubicon forum has pointed out that the "spare" hatch from the Warlord Panzer IV kit can be converted for use on the Chi-Ha.
The above is part 27 from the Panzer IV kit, which is the open hatch.
The plan is to remove the supplied hatches and use the two part hatch from the Chi-Ha kit.