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i have not tried elmers, might be worth a few sample squares to see how it compares, as for glass, there are two main types, e-glass, and s-glass. s is a little more expensive but much stronger, the only benefit to e-glass that i can think of would be that it is clear, s glass has a slight blueish tint. kevlar would be ideal for strength and impact resistance, carbon fiber for strength and stiffness but those are both very pricey! as for polyester resin vs. epoxy. epoxy wins every time. easier to work, easier to adjust set times, better adhesion, less voc, you can thicken it, repair it if need be, just follow instructions carefully, have fun.
small boat building books from the library can be a huge benefit when making slippery shapes, and they tend to deal a lot with one off designs and lots of ways to get around the same problems. you will come across with your project.
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