Exactly, and I agree with almost everything you said. The one part I'm confused with is are you suggesting placing tissues to form organs? Instead of placing preset organs?
"Then, from the 10 cells you design various tissue for late
multicellular, which can further be tweaked with sliders using the grid
system we are using for organelle updates (to provide a sense of flow by
using the same similar editor UI)."
Exactly what I was thinking. Then when you are in the organism editor the tissues are also editable using the grid system.
Yeah I think we can dodge a massive bullet by ignoring placement and just looking at organelle numbers.