Align 2x4 and 2x6 framing layers flush to exterior face

[j2narchitecture]

Hi.

 

I am trying to create a custom wall type to show an existing 2x4 stud wall being sistered with a new 2x6 stud right next to it.

 

I have both framing layers placed inside the "Main Layers" (core) section. However, the preview shows the 2x4 and 2x6 studs automatically aligning on their interior faces instead of their exterior faces. I need both studs to be perfectly flush against the exterior sheathing layer, pushing the extra 2 inches of the 2x6 strictly toward the interior side.

 

How do I force the alignment to lock to the exterior edge of the framing core? (Screenshot of my wall type definition attached below).

 

Thanks for the help!