Hi Charles,
The Overholtzer bracing is similar to the 5 fan Bouchet design except the bridge bar is absent and replaced with angled 'cantilever' struts running from the bridge area at approx. 45 degrees to the waist. This seems to be done (in my opinion) to resist the pull of the strings.
Overholtzer included a drawing of the Bouchet design in his book so I guess he was probably influenced by it.
He also employed an extra long bridge which to some extent partly replaced the effect of the Bouchet bar, although I don't agree with using the bridge to achieve that, due to the extra weight of rosewood.
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