I managed to make some more progress.
I got most of the cutting done with scissors but used a block and sandpaper to make the long straight edges nice and straight, the undertray is ready to paint, the body and wing just need the sandpaper block treatment on some edges as well cleaning up the lower edge of the body sides, and a few little tweaks. I think the wing shape turned out OK, I marked the lines with electrical tape and cut against them.
I was more concerned with making the body fit properly first then can finish it off without needing test fits.
I found the body is not a perfect fit and it pulls the RH side of the roof down a little, Oli4KE noticed your LWB bodies do this too, I managed to solve that when test fitting just the shell without the four black pegs, but then when I put it on with the undertray and retaining pegs the problem came back but its not as bad as it was initially.
I always liked the wing in the low position with mid tilt, but never knew on the LWB model you can't get the body off with it on in that position!
Is it just me or is the body a super tight fit over the retaining pegs?
I will probably paint the wing first and apply the stickers, then the body, and then the undertray though I may leave it clear so you can see the carbon chassis from underneath