well that's exactly how most toon-shaders work. they just do the copying, blackening, inflating and normal flipping for you in a second pass. others will use some sort of edge detection, but that can take a lot of work to look good in your game.

also i believe Drew was simplifying the process; you wouldn't want to just scale the entire model. you'd select convex parts and scale them individually.

since the shader automatically does it along the normals, it should work fine.

it's part of the toon shaders already on the wiki.

i highly recommend the official shader workshop that you should get with a7 (or find on the downloads page). you'll then know how to use HLSL, and the following will be relatively easy for you to do: render one pass with diffuse lighting or whatever lighting you want to use, then do another pass moving the position of each vertex along its normal, flip it, and render it black.

all in all it should take you about an hour, and you'll be able to write your own shaders

oh come on, asking questions is heaps of fun!!

julz