SteveT what software are you using?
User Tommes has done some pretty epic 3d models and renders of C64s and pretty much all big box Amigas, unfortunately still no A1200 but one day maybe. Anyhoo he's modeling in Autodesk Inventor and models look printer friendly.
Anyhoo take a look at the other thread about new Amiga cases.
Long story short, original moulds are lost, new would cost A LOT.
So a proper/accurate 3d model is the best first step in any case.