Martin advocates high protein (min 1.5g/lb), with cycling of carbs. Low carbs on rest days, high carbs on workout days. Reverse for fats.
Martin does not recommend a 72 hour fast.
If you are above 12% BF, eat 500 calories below maintenace on rest days, and just below maintenance on workout days. Your biggest meal with the carbs needs to be post workout.
No reason to mess with his program, because it's worked for lots of people. BTW, his food choices are clean, but not necessarily primal. Plenty of potatoes for sure.