In my lil boat I have the 4 point mount that is lag bolted into the stringers. It has a subfloor that covers everything but the motor area. In order for me to make a rail kit for it, I know I need access to the back of the stringers, but I also like having the floor back there around the motor. An idea I have is to holesaw a hole big enough to get a stringer washer and nut on the backside of the stringer and re glassing the hole. What are some other ideas? I could rip out the subfloor, but I would want to reglass it back in. If i do rip it out, how do you cut it out clean where the subfloor meets the bottom of the boat towards the gunnel? Whats the way to make sure the bolts stay tight?