Turns out the last revisions I made to my sculpture design were far from final. I've added the BODY/SOUL ambigram and made them alternate with the MEME/GENE ones. Ultimately I'd like to have them transform from MEME/GENE at the top, go through the nearly illegible one that says all four, to BODY/SOUL in the middle, then back through MEME/GENE at the bottom. That means I need to do a whole bunch of unique rungs, though, so I'll have to work on it gradually.
I also included the shadow-casters on the ends of the ambigram rungs. They are, at this point, blank. Partially because of the time needed to do all that cutting, and partially because I haven't fully decided what I want the projected message to be!
(check out the original conception of this project here, and a detailed description of what I'm the symbolism I'm intending in the second half of this post)