Type 26 size options and the central module

How did the Type 26 size options differ, and where can they be researched?

The options depended on the central module; Britain chose the base design, while Canada and Australia chose larger versions.

The proposals varied with the space inserted into the middle of the ship. British selection favoured the base design, while Canadian and Australian versions were somewhat larger. A greater enlargement could have accommodated an additional central vertical-launch section. A website comparing the earlier options is reported to have disappeared after selection and resisted recovery through the Wayback Machine.