23" S for head and shoulder
28"  33ILD for rib cage/lumbar & hips
28"  F for knees and feet

This is 79" for queensize (if I added right).

I am trying to make this simple for me to figure out (math challenged).  But also why can't the rib cage/lumbar and hips have the same ILD.  Your rib cage won't sink, but the hips will.  As for the knees and feet, who cares?  Those are so light this can be firm.  Right?

Just trying to keep it simple.  Also I am a side sleeping and the knees and feet are using the middle area anyway.  There is the problem the legs sink in for me. UGH.