Beginner Gardening: Gourds: When is a luffa ready to be harvested?, 1 by Morph

Morph wrote:
Here's a photo summary of my first dried & peeled luffa ~ hooray! I'm stumped for the moment, though. There are still seeds inside of my luffa. I was hoping to pour melted soap into the luffa, let it dry and then cut into slices.

Can I somehow remove the seeds without slicing the luffa? I really think the results would be better if I poured the melted soap into a whole luffa and then cut slices AFTER it dried inside the fibers. Any ideas?