You might what to take a router to the edges for the motor cutout. A layer of 1708 and 12oz mat together will usually bend good enough. Build the glass up on the outside and then maybe your last layer of glass(1708&12oz) wrap over into slashwell. If it were me I would grind off more gelcoat on the outside where u will be building up the glass. Basically so your last couple sheets of glass will overlap onto the original transom glass and cover more area. And grind the edge of the original glass where the wood extends up so it transitions from the glass to wood nicely, and makes for a stronger joint and less air.
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