The ports looked a bit susceptible to accidental damage, as the cables protrude quite a bit and there isn’t a pile of room in my dome at the rear of the refractor. I made a cover to protect the cabling. The camera is 90mm, this model had a diameter of 93mm, allowing for a thin layer of craft felt or neoprene to be glue along the inside, to make it a snug fit and not damage the camera.
I took the stock rear image of the 2600MC available on the ZWO website, and scaled it to 90mm in PS. I then printed it out and took my measurements off the printed image. The USB cables should be a standard size so this should work well for everyone. My 2.1mm power cable has the screw-on bit making it thicker than one without so I had to allow extra space in that column. If you wish for a narrower power lead column I've included the Fusion360 file for you to edit, or alternatively leave me a message and I can adjust and repost a version for you.