If your boat is in good condition (no corrosion, no cracks, soft spots or frays), you shouldn't have to add (or double up) on anything. Oh, and those places you're talking about adding glass . . . . adding glass to them is not going to add structural integrity to those areas. I don't know where you're going to sail or in what conditions but I don't think it's going to do you much good to do all you're considering. My suggestion is to replace all rigging that's more than two years old, if the boat has been sailed regularly and/or has been stored in the elements. My experiences have been on a 85 Hobie in the Pacific and have sailed about 15 miles off shore (you can't see land) in some pretty serious water ( 20+ mph winds w/10' swells) and the boat has held up fine on a number of occasions.
Don't misunderstand me. I didn't do this on purpose. But remember, this is the ocean. It has been known to sink battle ships so if you're looking for something impregnable, forget it. You also don't want to hamper the boat's performance by weighing it down. Oh, another thing. You might want to run your forestay a little snug, just in case your jib halyard gives way. Just my .02 cents.