The tactical absurdity of this thing is beyond the pale. You've got two massive main guns -- probably with a range of 25 miles or so. Thus, it's obviously a moblie heavy arty platform, right?
WRONG. You mount an 88 on a barbette to defeat enemy AFVs via direct fire -- thus this is some sort of super-tank. Idiocy in extremis. I can't even suspend belief and take it seriously as one of those 1946 What If models. You might as well put butterfly wings on an elefant and call it a glider.