I like the model, although I think a few countries should be juggled around.
Russia is probably more worthy of being in the 'tech of the first rank' bracket; if she is to remain as a tech superpower, then she should at least be penalised in army communications and logistics.
Ethiopia, Liberia and Afghanistan I would place in the 'lower third' rank, with all current members of that rank being relegated to the fourth bracket. Those three, at least, benefitted from collusion with modern powers and had been able to utilise their technology.