I suppose I'm not opposed to the idea of diversifying tiles, but frankly should they ever touch castles/ keeps again, I'd hope for a little more effort than that. There are a handful of these structures, and only a rare few, that can not accept a complete customization "option" were it made avaliable, based on where they were placed. Allowing the customization menu to extend to either 24 sq or 32 sq is probably the desirable solution for owners, though not necessarily neighbors, passers by or malcontents. Castles and keeps do need some dev love, and have for a long time. If they can't be rendered fully customizable where possible, a lesser but decent alternative lies in replacement structures on existing footprints, structues not so wasteful of space. Simply replacing tile sets, again, just seems to me to fall short of the mark/ desired effort.