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1. Yes - but you'll need to adjust your feeding slightly.
2. None
3. Depends on how often you want to water it and how big the pots are. I use straight coco, but if you want a faster draining medium, cut it 33p/67c or 50/50.
good coco is buffered at a ph of 6.0 which is ideal. so you don't need to bother with dolomite. if you use a nutrient solution with ph around 6.0 then the coco will stay pretty stable ph wise.
as for the perlit that's up to you, the larger the pot you want to use, the more i'd be inclined to mix in some lava rock or hydro ton or even perlit although i don't like the way it floats to the top with time.
Just as the g man said, though I'm in str8 canna coco. If you want to mix in some perlite for drainage, just fill the bottom inch or so of the pot w/coarse grade perlite to aid in drainage ... though coco drains beautifully on it's own. You may want to add a cal-mag supplement early on to avoid nutrient deficencies since you will be using Foxfarms, but then again the Grow Big is a complete fertilizer, so hmmm... ... it may not be needed. Best of luck and you're gonna love coco...