From what you are saying, you might be looking to turn a picture into a 3D model, rather than the light-and-shade conversion that PhotoVCarve does. This is something I did a while back - I can't pretend that it's good, but it's better than I expected. It's part of a project to make a nameplate for my house. I used 123D Catch to turn a bunch of digital photographs of the badger model into an STL model which I then hacked around a bit, and used Cut3D to turn into a toolpath. It was all done when I was new to the software and the whole CNC thing, so it's not done very well, but it illustrates the art of the possible, maybe. I could imagine using this technique to get an impression of an aircraft emerging from a flat plate.
Original model:
Click image for larger version.  Name: IMG_0007 reduced.jpg  Views: 590  Size: 331.2 KB  ID: 15486
Machined model:
Click image for larger version.  Name: badger head.jpg  Views: 625  Size: 253.8 KB  ID: 15487
The grooving effect is because I didn't use an appropriate step-over for the ballnose cutter used for finishing. As I say, it's not good but even to achieve this was a lot of work. I guess you might be able to find someone with 3D scanning capability, given an aircraft model as a starting point.