3D to 2D

[Rusty]

When i making mecha use 3d program some idea popped in my head, why not make some object in 3d, then use it in XP tileset especially present time object.
So i try it and put them in XP tileset but i encounter several problem because the object i render not really match the tileset, as you can see in pictures below.




My request is, does anyone know a way to make them match the tileset?