Cagey
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The 720 mod lowers the neck pocket floor to .720" deep, while the normal pocket depth is .625". So, you're only talking about .095" difference (slightly less than a tenth of an inch). The fasteners don't need to be any different because of that. But, the contoured heel on the body does make a difference, as it bites off substantially more meat on the body. In that case, you move to 1 1/2" screws rather than the typical 1 3/4" ones, but only on the two farthest from the bridge.
As for drilling in square, it's not tough. Just keep an eye on it. Go slow. Look at how you're holding the drill motor from two angles 90 degrees apart, and it should be obvious if you're off at all. A couple degrees here and there aren't the end of the world. Just be sure to apply even pressure, and not much of it. Let the bit do the work, while you keep the drill motor aligned. It's just wood. Even hardwood is no match for a sharp bit.
As for drilling in square, it's not tough. Just keep an eye on it. Go slow. Look at how you're holding the drill motor from two angles 90 degrees apart, and it should be obvious if you're off at all. A couple degrees here and there aren't the end of the world. Just be sure to apply even pressure, and not much of it. Let the bit do the work, while you keep the drill motor aligned. It's just wood. Even hardwood is no match for a sharp bit.