Pick your poison. both are leaps and bounds above kitty litter.
Nice humi for sure.
Can't speak to the reliability of heartfelt beads since I've never tried them, but I will say that purchasing the HCM beads was one of the best investments for my cigars and my new cabinet humidor. The humidity has stayed constant for the past few weeks. I'm extremely impressed and pleased with the results. Just some food for thought.
But man, that's quite a work of art! I'm jealous of your wood-working skill!