Joe, looks good.
When I laid out my transom, I made a 5" grid on it - positioned it so that none of the bolt holes for the motor mount were at an intersection. I believe I had 27 stainless screws sandwiching mine together. I left them all in place and glassed over the top of them when I had it in place.
I consider the fiberglass work like painting ... if you spend quality time on the prep work, including pre-cutting all your pieces and laying them near where they're needed, you can get a great job done in little time.
I used some mix-master buckets from our True Value store (Home Depot sells the same) for mixing resin. They're flexible enough that you can squeeze them and pop out a resin cast of the inside if you let the resin harden up. I would pour 2 or 3 with the resin I needed, and mix the hardener in one. When I was out of that batch (mixing about 12 oz. at a time), I had a syringe ready with hardener for the next. I couldn't come up with any other way to keep a wet edge without having to wait long enough for it to dry out.