I'm the same way about drilling holes in a boat, but If the interior floor is high enough with a full load then there shouldn't be too much going on back there plus some one-way scupper flaps. Just curious. Need to have the pumps anyway! I hope you never have to take one over the bow!
I took a big Hatteras wake over the transom of my Boston Whaler last January. I'm sorry, unsinkable or not, out in the ocean with Freezing water up to your ankles, the water never leaves the boat fast enough!
I spoke to B&B today about getting a kit. We'll see?