Wow awesome news Robbie!!! Great to see a UEFA EURO 2016 patch coming up being myself a huge EURO fan! Glad to see converting stadiums is being possible (between its limits, yet it's an amazing achievement!)
By the way, maybe you would want to take a look (and ask their permission of course) at the next ModdingWay Mod update as I think they are adding Albania, Slovakia, Northern Ireland, Iceland, Ukraine, Bosnia-Herzegovina, Croatia and Serbia and maybe you could take the rosters from there. Also, are you making 23-player only squads? I think it's better to diminuish the amount of players... but that's just my humble opinion
Oh and also real kits! Moddingway has done them too, but of course not yet EURO 2016 ones.