I am facing the problem with displaying the constrained lines.
On the sketch I can see that some of the line are under constraint - but they are.
On the 3D Part environment I can see that this part is constraned.
Can you please tell me where is the issue ?
you are missing some tangent relationships in the corners and also some of the wall thickness values are not driving dims.
Might i suggest however that for this model that you only sketch the outside profile and then use the 3D command THIN WALL.
I think frame generator needs cross section sketches like this, as it just does a protrusion of the selected cross section, but not sure.