you can export a .dae (Collada 1.4) from sketchup.
that you can import into Blender.
you will want to have the sizing done in sketchup first though,
changing the size of the shape in blender will mess the crap out of the flat shading.
find an .obj of the minifig, and import that into sketchup.
group your model (Group, not component, components will create backfaces)
then scale and ungroup the group.
* Note 1: You need to group prior to scaling down, this is because of how sketchup handles its faces. if a face falls below 1/64" the face will disappear. Unless you group it. the group will hold it together, as a locked shape.
* Note 2: By lining up your model with the minifig's hand, you will actually position it perfectly on the model in game. Delete the minifig and then export it.
* Note 3: once you export to Blender, you will need to select all the meshes that match in color, and join them. Even if they don't touch,
same color = same mesh = same group.
Happy Modeling
