pony wall framing, connecting

[Gary Pottenger]

There have been a lot of pony wall threads but my search didn't turn up anything.

Two problems - First the upper and lower walls are always framed identically (assuming they both have framing layers). Chief seems to use the upper wall for framing defaults ignoring the lower wall framing specs.

Second - the walls will not connect properly under a raised platform. What I'm trying to accomplish is to create a chase under a cantilevered 2ND floor that will frame out and finish out properly (not using soffits or solids). To do this I just raised the chase floor height and made the adjoining wall into a pony wall. Second floor not shown in images.

any help is appreciated