import chimera
mlist = chimera.openModels.list()
m = filter(lambda m: m.name == 'viper-1rhi.pdb', mlist)[0]
import MultiScale
d = MultiScale.show_multiscale_model_dialog()
d.multimer_type.set(d.multimer_icosahedral)
d.make_multimers([m])
chimera.viewer.viewAll()