Man, I'm 100% in your project, and I've been intersted into modifying LoL since long (being a Minecraft kind of modder before, I don't have much experience with retro-engineering, but I have the appropriate motivation and basics to start learning and be effective).
I already know some modifications.
I can also recommend contacting Yurixy (Google is your friend), because he made a lot of custom map skins, including for 3v3, and with changes as big as the New Summoner Rift Mod (complete remodel and texture). So he could help making a skin of the map…
But making it selectable in Custom is another story (edit mod_man.dat and this kind of stuff). Also you can contact people at Leaguecraft.com for help in designing, some people are really stunning (look "Sona DJ", which is a skin I consider looking professional enough to be sold by Riot, but is fan-made).
Contact me through mail (
) or better: Skype me!
Username: chaeristheg33k
Don't judge me based on this username: keep in mind I created this Skype account when I was 11, so 5-6 years have passed. I was trying to put League of Legends beta interface at the time, and it was working quite well with just a few minor bugs. Considering I was 11 that gives an idea of what I can learn to do
You are trying to make an awesome work, stick to it (I now regret never finishing this beta interface, you will regret not trying to finish this mod).