Save all three files on your computer, they will have the correct size although they have been shrinked to fit screen here.
In this cubee, the tricky part has to be the hair piece. Simply assemble both hair pieces as if you were making a cube, and don't forget to cu the black rectangle as it is where Rico's Head will go.
Oh and one last thing. The hair seems to be too heavy for this little cubee to bear, so it's possible he's gonna need to be put against a wall or something to avoid him to fall back.