Thought I better introduce myself before I start asking questions!
I'm not an Alfa man myself, although rather like them. My vehicles of choice are Land Rovers, having owned loads of them at one point and now down to 3. My Alfa fanship comes form my Godfather working for Alfa when I was a kid and my Alfa cap that I was inseperable from.
My dad has had a S3 Spyder for a few years now. 2 years ago I had to replace the spare wheel well, front valance and plate under the front (can't remember what it's called, it's a new language to me!). Last year it went for MOT and came back with lots of yellow crayon on it.
I started investigating the rot (I'm used to old Range Rovers with sills like swiss cheese) and found more than the MOT man did. Have bought to fit: both floor panels, rear skirt, drivers lower front/rear wings, passenger outer sill, driver all sills and jacking points.
I'm in the process of doing the drivers side (floorpan removed, doorframe braced and all sill panels cut out) and will duly post up some pics of where I'm at and scratching my head about.