Thanks for your input Kathyy! I'm going to look for a screw this weekend. Hopefully there will be ones small enough Once I add moss onto the DW, it should cover the screw. You brought up a good point that all my rocks are large, which could be why I can't seem to find a way to make the layout flow. I'll find some smaller ones this weekend to test out. Sadly, I was already trying to go with an iwagumi layout. I'll keep messing around with the hardscape to find a layout with a good flow.
Any chance someone knows about attaching flame moss? Can I just tie it down like any other moss?