Chase wall for plumbing

[BB boy]

Masonry building, modeled w/HD 10Pro. Plumbing needs to be in chase wall. Wall is double 2X4 w/3"centered chase. When I attach chase wall to CMU wall, the attachment changes the detail. As long as the framing does not attach the CMU corner appears in plan as it would be built in reality. I know I can do an enlarged "CAD" detail showing the proper connection, however; I want to be sure the Mason (who will be on his own supervision) has a good understanding that the "normal" masonry details apply, and I'd rather "all" the plan details agree. I do plan on doing a detail sheet of course, sometimes the details get lost.

I couldn't find a fix.
Sketches attached.