Try using this DXF. from this German Site. Ed hawley did the drawing and the pickguard is separate from the body.
Stencils and drawings - GitarreBassBau.de
53BODYMASTERNSNOFLAT1. .DXF
(58.42 KiB) Downloaded 13186 times
There is also this thread.
To import a DXF file, choose the tool with the arrow within a Square.