Anyone ever seen Marlboro livery skins for RB4? More precisely Freddy Loix's Celica ST205 from 1996.

http://renaissance-models.com/images/Catalogue_CD/030d.jpg
http://www.depaddock.net/sennake/models/celica_63.jpg

I might be doing this soon, so I just want to make sure that no one has not done this before.

That looks more like a Marlboro livery than a Mobil 1 scheme I don't have time right now, but I'm sure someone else will take up your request

LOL, I don't know why did I write Mobil 1... topic name fixed.

and I want to do this myself, but no need to do it if someone has already done it. That's why I'm asking.

I haven't seen one yet, so I think you're in the clear to do it yourself