[Mesh] Open source wifi router for crisis situations using atheros wifi

Hi all, I'm one of people who started www.meshpoint.me - idea is to build open source wifi router that can be easily deployed in any type of crisis situations. I have been setting up wifi networks in crisis situations and I know that there are no devices that are usable in crisis situations. Belive it or not but first responders usually aren't network admins :) So that is why we started developing MeshPoint, wifi device that anybody can use in crisis situation. First iteration will use off the shelf components and later we plan develop our own wifi router board using atheros hardware. Our current design (as you can see on the web site) uses three TP-LINK WR842ND (AR9341) boards in 3D printed case. Our concern is that this could generate too much interference and cause too much L2 retransmissions because of co-channel interference. We are using latest OpenWrt 15.04 Chaos Chalmer and ath9k driver and would like to know if it is possible to extract metrics that shows number or L2 retransmissions. Do mac80211 or ath9k tracks L2 retransmission statistics? How can we get those metrics if they do? anything over that is cause for great concern. Is there any other metric that you would suggest we track that would show some issues due to wifi interference? Is there anyway to get AR9341 datasheet? Cheers, Valent.