Hi Huw There is always lots of talk on this forum regarding sills, they are one of the killers for our cars and probably the major contributor to why the numbers are diminishing. Typical received wisdom has been to budget 1,200GBP (Sorry, I have a foreign keyboard that can't type the pound symbol) per side and recently this has been criticised as too high, a number of members have managed to replace theirs for considerably less. I believe that the panels alone are in the region of 250GBP per side and if the sills have gone then another place to check are the rear sections of all four wheel arches and these normally need to have patches made to suit. If you can do the work yourself or 'have a mate in the biz' then I believe that the majority of the work is labour related, and you will be able to keep the cost down. I bought my car three years ago knowing that it would need new sills, it went in a couple of months ago and is having all the sections I referred to replaced, as well as the tops of the doors which had also started to go. The very slow man doing my work is meant to be some kind of magician and as I plan to keep the car a long time (have you had a chance to properly drive a 944 yet?, most of us on this forum love the cars!) so I am prepared for the high cost, I had three different quotes and all of them were in the region of 2,500GBP but I am also including a few other dents and almost a complete re-spray in that work. Before being too despondent, have you tried the trick of slipping a webcam/camera into the sills to see how bad they are inside? you can use the ventilation louvres in the door jams to gain access. Depending how good the rest of the car is, I would really consider how much you want to invest in the first couple of years and where the bodywork costs fit into this scheme. As always its a personal choice but many people would spend this much money putting shiny wheels on an anonymous modern hatch and not get anywhere near the driving enjoyment that you could achieve.