1970 Seafari conversion to CC

[afishin82]

I got this boat for a great deal and am lookin forward to make this boat like new! I jumped in head first and have already ran into something I am unsure about I got the cap and floor off and noticed that the stringers are hollow except for a single 1x3 running the length of the stringers. I want to cut the tops off, raise the sides of the stringers, foam fill them, and then reglass them. Not sure if there is a better solution that will be less work, but if there is I would love to know! So im just gettin started and hope you guys will chime in if you see something that doesnt look right. Thanks!!