Half tonneaus don't work that way. They're at the yellow line, but only cover the
back half of the bed.
What you're cribbing from the Ridgeline is more of an half aerocap. Try 'half tonneau' in the Search box. I looked at a few but they were dead ends. This one is on-point:
https://ecomodder.com/forum/showthre...ate-36859.html
edit: Never mind, that thread is this one.
There was a thread where someone took a canopy and cut it down to half length. A true aerocap will have taper above the bed rails.