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Anodizing aluminum for insulation requires PURE aluminum. This is particularly true of thin layers with parts bolted to them. Alloys produce unpredictable coatings both softer and more conductive than desired. Go over those MOSFET tabs with a whetstone to chamfer the edges and corners. You are probably better off with through holes, insulating sleeves, machine bolts and nuts than tapping holes and expecting the anodizing to insulate the threads. Last go-round on anodizing for insulation was microvolt level EEG signals.
Talk to your anodizing shop BEfore fabricating the parts. ask me how I know
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