It is most important how the forum rules and their "snippet rules boxes around the forum" work together.
Outrule the more specific rules (on the specific pages) the general forum rules?
Or is it the other way?
I'd also suggest to put in the forum rules only the information, that is not shown as a rule on the page where you have to apply to these rules. Example
On forum rules page do not mention "For images in signatures: 1 image up to 300 pixels wide, 125 pixels tall and 20k in size Animated images in a signature are not allowed" as this is stated and even controlled on the edit signature page.
However mark in big red letters these rules that overrule / add rules to the rules information box on the edit signature page.