I have just set this up a week ago at my apartment. I use hostapd and dnsmasq on a raspberry pi to make it a wireless AP. It is connected to the primary router via ethernet and uses iptables to route wifi traffic via ethernet. Then I just installed OpenVPN to route traffic via a VPN. I haven't tested for DNS leaks yet as this is an ongoing project.

There are a couple of other things on my todo list still. Such as easier switching of VPN node (current method is to ssh in and restart OpenVPN with a new config...) and ad blocking.

Hope this can help you although it's still a bit immature and quite hacky IMO