How a twelve-gun Hood would reset treaty limits

If a Hood-type ship with four triple 15-inch turrets were built, would the treaty powers ignore it?

No; its firepower, speed, and likely 45,000-ton displacement would force the treaty system to adjust.

The proposed ship becomes a new standard rather than a loophole other navies could politely overlook. Twelve 15-inch guns, Hood-like protection, and speed probably above 30 knots would make it an unusually dangerous capital ship. The design would likely reach about 45,000 tons standard displacement. Treaty negotiators might resist matching it exactly, but its existence could push an agreed limit upward from 35,000 toward 40,000 tons.