Whilst i have been busy with the wraiths my brother has been converting up a Triarch Stalker. Made entirely from a ghost ark box it was easier than it looks. If you look at the picture in the codex it’s not too far off. If you read the fluff it’s pretty much spot on! I believe it is described as a gigantic mechanical spider. He is in the process of painting it so when it’s done i will make sure i take a picture.