I started running a Deathwatch game myself, and have in my spare time been creating homebrew for my players. Here's one of the custom Chapters I made to give them an option (they all have shit fellowship, so might as well keep them comfortable). Keep in mind I have used ChatGPT to help make this, as I have found it to be fairly competent, but I still want some good critizism as it should be as balanced as Space Marines can be. And to the point I made above, we have a Flesh Tearers Apothecary, an Iron Hands Techmarine, a Blood Ravens Librarian, and a Blackshield (Black Templars) Assault Marine.
https://mega.nz/file/OkABGZ7Q#qHpl4BQ9aMlNCWR83rxFJkFywosoVOoFM1xqmfTWbcw