Holy makaroni! This is awesome!
What's the other data for the Battleship M?
That's basically everything written on the chart:
Armor values are 12-inch (305mm) for the belt, 13-inch (330mm) for barbettes, 4.5-inch (114mm) for decks and 3.5-inch (89mm) for bulkheads.
Armor values for turrets are not given but they were supposed to weigh some 1.700 tons each; i obviously think that the face armor was to be at least 18-inch (460mm) thick.
Top speed was 30 knots, as for endurance, guessing from other 8-8 fleet projects it would have been at least 8.000nm at 16knots.
Armament was composed of twelve 18/50-inch (457mm/50) guns in four triple trurrets, sixteen 5.5/50-inch (140mm/50)guns in casemate and four 4.7/45-inch (120mm/45) anti-air guns, eight 610mm torpedo launchers were also included.
Standard displacement was some 57.200 tons.
As for overall dimensions, there is no (or i do not have found) data, yet i know for sure that Battleships I/J (the one armed with 16.1-inch quads) were to be 34meters abeam.
In order to hold such massive guns on the given dispacement (and have space for engines powerful enough to drive her to 30knots) she would have needed to be some 278 long at the waterline and 36 meters abeam, for a draft of 9,5/10m; this means an overall lenght of over 281m and a possible full load displacement of 66.000 tons