Good start neoro! That's kinda similar to what I have. The issue with the sheets is that they have no natural curl. So they will not want to follow those tracks. Maybe if you precurl them....

But the thickness isn't too different from MF film. It is a bit thicker. But there are also different thicknesses in LF, some bases are thin, some are thicker. If you want to experiment with an inexpensive film, try the ortho films at freestyle. They are quite thin.

I am still working on making my funny holder work, but frankly I am not really sure it's worth the effort!