Here is the post buy the guy who came up with the beats mod, it has a step by step guide.
https://www.head-fi.org/threads/1more-h1707-triple-driver-over-ear.849824/page-27#post-14271670
I just made the cardboard version to fit dekoni pads today, which doesn’t use the original parts and obviously doesn’t seal quite as well. TH-X00 pads should be a good alternative to beats as it has a similarly small opening which preserves the original sound – if you can adapt the original parts to fit dekonis i would definitely try to do that.
