To avoid your mix overheating too soon, pour it into a larger, shallow container so it spreads out and stays cool. You can stick the mix in a fridge too. Also, for that part it would probably be easier to apply the glass and epoxy before cutting out the hole, then add strips of glass and epoxy to the inner edges after you cut the opening, or just use plain resin with no glass since it's not really a structural piece. Whenever possible, rounded shapes are easier to lay the glass on than sharp corners.
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