Keep in mind that silicone aquarium sealant can take a long time to dry, especially when put on thickly, as you might to secure rocks. It dries from the outside of the bead, leaving the inside moist & off-gassing for a week or longer. It's irritating & pungent until it's completely dry, so personally I'd plan to let it dry for a few weeks.
Sounds like you're really doing your homework & I suspect you'll have a wonderful habitat when you're finally done. You have some great ideas & apparently the creativity to also succeed.
I lived a long time in the desert, & I can appreciate how frustrating it can be to grow some of the native plants. I never tried to grow creosote but I struggled to duplicate my large & magnificent bladderpod shrubs- they flowered a long time & kept bees & hummingbirds happy.
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