Hello again!
The project 'Linienschiff L3' was one of the proposed designs for a successor to the Bayern-class. It differed in being 50 meters longer, 9.000 tons heavier (37.400ts) and four knots faster (26kts). Armament was identical, and so was protection, with the exception of the uppermost armoured deck, whose thickness increased from 40mm to 90mm. The design was eventually rejected and the 44.000 ton project L20e-Alpha with 420mm guns was chosen for production in 1918; IMHO the L3 nevertheless was the most sensible (and feasible) of all german battleship projects, because it used already available guns and emphasized horizontal protection (both of which the L20e-Alpha did not).
Greetings
GD