I've made a few tweaks to the infobox styling. Still not happy with it, so I'll continue to tinker.
Further tweaks may be required for the styling of the infoboxes. Currently the styling is included in the template code itself, which means when the whole site theme changes, the infobox style is left looking out of place. I will look into moving the styling css into MediaWiki:common.css or Wikia.css, as I have seen other wikis do, for ease of future changes.