In my opinion the hex you have sounds good. Put about 10" of potting soil/peat moss mix and let the cobalt burrow!! The Goliath Baboon is not really that bad, I never see it!! I know it has the bad temperament of all baboon spiders, but as long as you don'tplan on handling the spider they are no worse than a cobalt. As for what you said about ugly, well, it is just brown, so it's a matter of personal choice.
Andy
Andy