Looking forward to seeing the work 😃
The seal between the skirt and body is nla but pop up occasionally for sale - be prepared to pay a premium for them though.. I have seen them priced over 150 a side.
An alternative is to use a upvc window seal. Huge variety of sizes to choose from. You would need to have your originals to measure size required.
There was a discussion a while back about them being used.
I have a link saved in my eBay of a set but I have read it being a little bigger than std and required trimming. With this in mind I would try to get a better size.
Here it is anyway.
http://www.ebay.co.uk/itm/331113212395
The seals under the arches are different to the skirt seal. No idea if Renault still stock them but I would bet some have a decent set stashed away so would be worth putting up a wanted add.