Hi Thomas!
So your project is building a CM15a (at least that's what I use) with just an arduino+rf transceiver+x10 powerline adapter? I recently started having issues with my cm15a ignoring rf signals after about a day, and is only remedied by unplugging the usb, power outlet, and the batteries, and then reinstalling, so I'm curious if this would be a better solution.
Thanks for sharing your work!