Here's a good video I ran across with the basic procedure that fits what you need to do more closely...The only thing I can see with this video is it assumes you have the stringers installed and you're ready to glass them in...Remember, the bottom needs to be EXACTLY where it needs to be when you install your stringers... It's recommended to mix up some resin with chopped glass etc... for strength and "glue" the stringer down to the bottom with no air pockets between the two...And that's where this video picks up from there...https://www.youtube.com/watch?v=9jHUI0CiYbs&app=desktop