I finally got outside and did something!!!
Cut the bottoms off the doors! All went quite well but then the cat turned up looking a bit rough so had to get him to the vets
So, as you can see, theres now nothing for the door seal to attach to at the bottom and as much as this is to be a fair weather car, I'd still like something there just in case. Suppose i'll worry about that when the cars ready to go outside. A bit of additional bracing will be added and I need to remove some more door metal at the rear so that it clears the rs200 bodywork before they can go back on... maybe a bi of rust repellant too!