On the Icesilk+Ice Maiden subs, I've already worked out something. My solution is to put the Icesilk as a Stub since I've decided that the discovery story should really be a stand alone. I also have the Icesilk stub currently being a part of a Codex titled Silks in fantasy settings (I just had a spell of creativity with types of silks one day and the Codex was the result of it).
Actually, I haven't considered the Scroll method before and probably with the Icesilk being a Stub, I don't need to have a Scroll but thanks for the advice.
On the nested Codices, I know exactly what you mean. I think the code isn't made for nesting codices because I went back to the Citadel explained and in explaining a Codex, it talks abt subs that are linked and crosslinked as in "parallel/horizontal subs", say different schools of thought on a topic or sth like that. For the purpose you and I have in mind, we are dealing with "vertical subs", so probably that's why it doesn't work out.
Overall, thanks for the reply.