Well, that looks like it's going in the right direction. You need more holes and closer together. I did it with a plastic grain scoop with a thinner wall and it lasted over a year... actually it was the handle that broke, not the holes. I would also sand/file the under side of the lip to help push it through the wet sand. Finally, where did you get the support for the handle? I've never seen one. I think if you have a weak point, that might be it. Keep refining and post a "how to" in the scoops thread at the top of the beach forum.
R5