You could very well use a cemented straight floor section to make sure that the hull does not start off being crooked right from the beginning; you can never make it right if that happens; but i'm sure you work with what you have, and you level it off first; Nice work,i'm sure it's a lot of work and a lot of materials used; how long does it take you to finish a boat like that?
If there was a video of white or Asian men building a boat like this, the comment section would be full of disbelief and ridicule. The fact that it is full of praise betrays some kind of benevolent racism.
*looks at the bobbled badly formed boat.. * wait what they are bothering to sand THAT? (goes back to the Thai teenagers vid of him making a speed boat from scrap solo...)
Polyester is much better with fiberglass mat , if you want epoxy you have to use fiberglass cloth, but the mat polyester combination could be better for this application