firewalld example gateway

Hi, many people using Fedora/CentOS/RHEL/.. for organizing gateways, with transparent proxy or with many other options. And they using iptables. I have not seen any examples for organizing gateway with/without transparent proxy using firewalld. I think would be good if we will have this how-to. Thoughts? P.S. I can't write this doc, because I can't set it up =( -- -Igor Gnatenko