Good question, I had forgotten to include that. The 3x2x2 or 4x2x2 will be for my young ball python. She's still doing fine in her current setup, but it'd be nice to move her to pvc in a couple of months for the winter humidity drop. This isn't time sensitive, but I'm also looking forward to not needing the CHE setup.
I also plan to get a morelia bredli soon, probably before winter shuts down reptile shipping. I'd probably put it in a 2x2x2 immediately after quarantine, then expand that to 4x2x2 and beyond as it grows.