You're talking about making models using blueprints. I dont recommend using MED to create models when there are also free tools like Blender/Anim8or that have more tools to create models.

I use 3DS MAX for my models and loading blueprints and modelling (poly-modelling/NURBS) is very easy if you have the right sized and quality blueprints.

First find yourself a modelling program that you are comfortable with - like creating models from basic shapes/primitives and then start moving onto the more advanced modelling like poly-modelling.