I’m very glad you decided to try your hand at this jam, too. I, too, usually have problems conducting adventures by the book, and I admit that in this jam I decided to try to exceed my limits, just as you are doing. It has to be said, though, that Cthulhu Dark helps us a lot in this: the structure of the mysteries is not really a railroad, and it plans to be freely explored in all their parts.
Your idea sounds very interesting to me and I can’t wait to see what you’re going to bring out of that premise. Remember that investigators should be people with little power (for example, university students) and that the place of the final horror should be, literally or figuratively, the endpoint of a descent (for example, an underground laboratory). The best of luck!