Yes they did make RS turbos without sunroofs, they were known as non custom pack. Also as a non custom model, they had no central locking and no electric windows.

There is no such thing as a motorsport shell for the S2 ERST, They were never rallied by Ford, But were built for I'm sure GRP N rallying in mind. Which lots of owners did use for that purpose.

Non custom models was an option during the early period of the MK4 Escort production, But this option was phased out roughly 1988. They can be found on C-E plates.

Incidentally the Series 2 was produced in 6 different colours... but that's for another thread.