All you have to do is make a MODX file, whether it be created by yourself or it be a product of a text template to MODX conversion. The whole style/look-and-feel of the MODX MOD is nothing you have to do-- a valid MODX file will use that prosilver stylesheet that you posted. You don't have to do anything to style your MOD to get it to display that way; we provide a stylesheet (XSL file).
I'd recommend reading up the content we have in our MODX Resource Center, and reading some more information on XML in general.
Former phpBB MOD Team member
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