Any amount is too much for Glass Hulls from my experience . They are too heavy, too flexible and usualy the skin has broken away from all the framing inside . Better of with a ply boat, it least it can be fixed.

I took one of these to the tip years ago, rolled the hulls off into the hole, kept the trailer and rig though .

Dagger rudders have generaly been dropped from cats. The ones I have used had too much slack in them and scratched the blades, also most have no fail safe if run aground, which makes damage likely when you have 2 to pull up in a emergency.