Does anyone have an idea how to recreate the default virbr0? Is it doable via virsh? I don't have a DE installed on this server, so no virtual-manager. I am willing to go that far if it's worth it though.
You don't need a DE for that just yum install xauth virt-manager and ssh -X to forward it to your local X server.
Although I do a fair amount from virsh and editing XML if you don't use a cluster manager/tool/IaaS like ovirt, openstack, archipel etc virt-manager is too useful not to have - especially to get console access to VMs nicely.
I'm home now but if you're struggling on the bridge part come Monday send me a mail and I'll send you my server network configs to give you a start on this.