Wow #5, great work! I like the filework, looks nice filled too. Keep up the good work. I like the red spacers and mosaic pins also, really looks good with the scales.
I use clear epoxy on most voids, and it depends on the wood and the size of the hole if I want to color it or not, I use black most of the time. On small cracks, holes or voids I will use CA glue (super glue).
Hope this helps,
Bruce