Get a really big metal bowl and place it over a large sauce pan/pot containing about an inch of water. Put this over medium heat.

Dump in the chips in the bowl and stir with a rubber spatula (every now and then) until they've melted smooth. You can walk away from time to time but be careful not to let the water get to hot or the cocoa butter will bog.

Dump everything else in the bowl and fold over and over until the hunks and chunks are well coated.

Spread the mess out on parchment paper or freezer paper and set in a cool place until it sets solid, then break it into pieces and seal in tins.