These are the files I used to build my custom IIDX controller. Build log is at imgur: https://imgur.com/gallery/a1HnG
I also made a few blog posts about the deck: https://twa.ninja/entry/iidx-deck-build-log-part-1 https://twa.ninja/entry/iidx-deck-build-log-part-2 https://twa.ninja/entry/iidx-deck-build-log-part-3 https://twa.ninja/entry/iidx-deck-build-log-part-4
They might not all be totally up to date, and no warranty is expressed or implied, etc. You're free to make your own using this as inspiration, or copy it exactly.