Why not make a CS-like fps game?

I am a game artist for 3 years.
I hope there is somebody port CounterStrike to PPC,
but nobody do it yet.
And PPC's speed is impossible to play CS smoothly.
So,I want to make a CS for ppc by myself.
Is there any 3D engine programer want to make a CS-like FPS game with me?
I prefer 3D scene with 2D sprites(8~16way direction)
Just like Doom.
Cause full 3D polygon(as quake)is not faster enough on current cpu(at least 20fps in multi-player).
Gun and enemy in 2D texture
Scene in full 3D[/img]
I hope there is somebody port CounterStrike to PPC,
but nobody do it yet.
And PPC's speed is impossible to play CS smoothly.
So,I want to make a CS for ppc by myself.
Is there any 3D engine programer want to make a CS-like FPS game with me?
I prefer 3D scene with 2D sprites(8~16way direction)
Just like Doom.
Cause full 3D polygon(as quake)is not faster enough on current cpu(at least 20fps in multi-player).

Gun and enemy in 2D texture
Scene in full 3D[/img]