Tweak existing skin to 21:9 or 2.35:1

Hi

i've never played around with skinning, but i would love to get into it for the only reason to make a usable 21:9 or 2.35:1 skin for Home Cinema users with Beamers.

If anyone could guide me or tell me how to get started i would give it a shot. Or even if someone or a few people would be interested in making such a skin with me together.

Thanks in advance

Regards