Another thing we did is used a step drill bit to cut the holes in the hull for the thru-hull fittings. I have to say that it worked great. The largest step was the 1 3/8 size that I needed, so it was easy to just drill until the whole bit was through.

Likewise, I'll be reusing the brackets that were used by the factory to hang the drain pumps. I just had to drill out the hole in the brackets to fit the thicker pumps. Again, the step bit was perfect for making the hole bigger.