The 605 was basically a DB 601 with the cylinder block redesigned to increase displacement from 33.9, to 35.7 liters (~3 liters cubic capacity!) Not to be technical, but 35.7 - 33.9 = 1.8, not close to 3
Thanks for creating yet another missing aircraft. One major problem I had is that there are no fuel tanks defined, so the engine wont run. Yes, I could turn on unlimited fuel but that would be cheating.