Making a 962 engine is an interesting thought if you're willing to take it all apart, and reverse-engineer everything.
1).
https://www.nextengine.com/indexSecure.htm to scan individual parts.
2). Spend gobs of time cleaning up the CAD model to seperate and hollow out runners.
3).
3D Printers - Dimension Printing - 3D Printing, 3D Printer, uPrint, Rapid Prototyping to make a plastic model.
4). Milling/moulding/other.