When I see build hosts with names like arm-builder12.home.rpmfusion.net, that makes me wonder if someone is loaning out their arm device to the rpmfusion community. I have an odroid-hc1 that is always running, whose primary purpose is to build arm packages for the upstream project I work on. It is not running Koji, but that can be arranged. If I have missed documentation about this, please point me to it. I'd be glad to help in this capacity if there is a need.