Ok here we go. I am including a link to a LP file that I made. This is not a full 3d solid like you would create in Solidworks, but you should be able to take what I have here and create what you need. In this file you will find the outline of a LP with all the cavity shapes. You will also find a surface that replicates the carve on the top of the Les Paul.
A LP usually has 1.5" thick mahogany body with a .750" thick maple cap on it, for a total thickness of 2.25". The carved section is .5" deep at the deepest point. If your dad takes the out line and extrudes it to 2.25 and then lays the surfaces for the carve so that the highest point of the carve is at the top of that 2.25 extrusion, he should be able to trim his solid model the that surface. It sounds confusing, but he should understand if this is what he does for his work. You will have to do a little research for pickup pocket depths and what not...I don't remember what I used. Here is a link to this file:
LP file
when you click the link just choose to save to disk. This is an IGES file...your dad should be able to open this. Here are a couple of pics of the LP I built from this file.
The body outline is right on the money of a standard LP. The carve is my own creation and is a little more extreme than a regular LP. I did not include the neck pocket in this file...I varied from the standard LP and I didn't want to confuse anyone.