Is there any CAD files on how the Amiga 1000 (and A3000) chassis is manufactured? and what plastics is used?
If you are trying to create a rapid prototype (3D print) you will need a CAD file in STL format. But if you find 2D drawings with dimensions, you can use a 2D to 3D software conversion package to create that 3D model. The enclosure of the A3000 and base are made of metal alloy, but the front panel I think is made of High Density ABS plastic.