Given that it would have been pretty weak in an offensive role (thin armour, and the war had changed impetus), what was the point of putting a turret on it? A purely defensive vehicle in the WW2 context doesn't need one. By deleting the turret you decrease complexity by as much as 35%.
And the autoloader would have malfunctioned during regular use, that much is certain.
And the autoloader would have malfunctioned during regular use, that much is certain.