Re.
Lost Worlds: Scott has the final word, here, but my understanding is that, aside from publishing brief writings of CAS, himself, it is a strictly a scholarly journal devoted to CAS studies, and does not publish others' fiction. This will give you an idea of the contents: [
www.amazon.com].
If you have written fiction that is related thematically or stylistically to CAS's, then you might consider submitting it to this very site, in the "Tributes" section.