Project- Ford Escort RS Turbo

I was not able to find the exact "RS Turbo" model you were asking for but there are a good portion of Ford Escorts out on other websites. Developing a whole car is no simple feat, but if you are only looking for the outside profile so that you can scale it down and print out a few copies, you may find what you're looking for at the following links:

https://3dwarehouse.sketchup.com/search/?q=ford%20escort

https://www.3dcadbrowser.com/3dmodels.aspx

https://www.turbosquid.com/3d-model/ford?keyword=escort

Though, if you are looking for tutorials or directions as to how you could create one yourself, I would suggest some good training material on YouTube.

What have you made so far? Give us some details or what you need help with.

Some "blueprints" are online https://www.the-blueprints.com/vectordrawings/show/17962/ford_escort_rs_turbo/

This model exists, but it likely needs to be repaired, and/or modified: https://www.3dcadbrowser.com/3d-model/ford-escort-rs-cosworth-1993

This is a sketchup model, it is sure to need repairs: https://3dwarehouse.sketchup.com/model/213eed47671b34981a48cf85d161a723/Ford-Escort-RS-Turbo-Series-1

Ready for printing/buying: https://www.shapeways.com/product/KG38UKB68/1-64-ford-escort-mk3-2-door-rs-turbo-whale-tail

The good news about a toy size scale model is that a lot of mistakes and errors are hidden. What scale/size are you aiming for?
This Lego version might be a good compromise. A few hours, and maybe $20 in bricks: https://www.flickr.com/photos/29987108@N02/36057537191