@JeremySchmidt - My Makita RT0701C measured exactly 64.75mm, which is 2.55 inches. I took the drawing for the DW660 and just enlarged the center to be 65mm, and it works fine. I had my local community college aviation machine department make the parts for me. It gave their students a nice real-world design project, and it gave me some nice mounts. See this thread, or search the forums for others.
Also, check out Targ’s Workshop on YouTube. @Targs_Workshop (Matthew) is on these forums, as well as the Shapeoko forums, and that is what he uses. Good luck.
BTW, I seriously wish Inventables would just make a mount for this router already. It’s a great router, and it is gaining popularity quickly.