I think there is a toon shader(cel shader) fx shader in the Ultimate Shader Pack that you can grab from a link somewhere in these forums(just search for it) -- should give you something similar to what you are looking for, just might need to do a bit of reading on pix and vert shaders and how they work etc to be able to use it effectively... a good starting point for using shaders in a basic way would be the DarkGDK samples... i think there is a couple of em that use shaders, one specifically demonstrating them....(also DarkShader is a good tool if ur not 100% sure on shaders, has a kind of visual shader design interface which makes it easy to design shaders that look how u want without having to know the shader language back to front...)
Scaling an object so far back is something ive not done in GDK before... Does it result in the object becoming turned inside out, kinda(my 3D modeller turns objects inside out when ya scale em too far -- inverts it sorta, the object ends up mirrored left/right)like, changing the way you need to reference its positions/axis in relation to its limbs(right becomes left etc) ? it wouldnt be too big of a deal either way im just curious... but it would certainly look unique
If it ain't broke.... DONT FIX IT !!!