Body filling done. One thing to note is that the pointed profile either side of the boot lid is not symmetrical. I think I've managed to get it about right. I'm sure I'll find out when I get a coat of primer on it. I'm contemplating simulating the carpet texture on the floor pan, hence the pencil line where the rear seat starts.
A quick rough coat of Mr Surfacer was allowed to partially dry, Then I stippled it with an old brush cut to around 3-4mm long. It's not great, but it won't be all that visible with the seats in and the transparent parts fitted. It just needs to be not smooth like it was before.
I noticed that the underside of the front was not sitting correctly. It was skewed to the right and had dropped too low on the left. Several very careful sessions of twisting and pulling to shape look to have it sitting properly now.