mobile

Hi all, I've been having a little hunt around for info on building AOSP 5.1 lollipop for xperia M2 aqua but have only found info and commits, device specifics etc for all other xperia devices apart from the M2 aqua so i'm now at a standstill 'cos I can't work out what's what. From what i've read the M2 aqua's codename is seahawk but the closest in name I found on the sonymobile developer site is seagull and there's no mention or info on seahawk! The only stuff I see on the sony dev site are for the following - amami aries castor eagle flamingo honami leo rhine scorpion seagull shinano sirius tianchi togari yukon , does anyone know where I should be looking or what to use to build 5.1 for m2 aqua? Once I've found the info i'd be willing to set up and build a 5.1 AOSP rom for the device as there isn't much out there for it. Many thanks in advance.