Accurate background ripping from Melee?

So, I'm looking into trying to pull the Battlefield background models (simple as they are) from Super Smash Bros. Melee. I'm aiming to get the three large concave structures that rotate (using mapping generated by normals to subtly warp environment textures), as well as the static cylinder that shows between transitions.

With any luck, the end result will be importing into Brawl as an edit for Project M's current 'Melee Battlefield' stage, which is distracting as all hell.

Using Dolphin and DirectX, what's the best way to do it at the proper ratio?