Dynamic double strectch rectangle. Inside rectangle doesn't follow outside rectangle equal.

[YoshiCoolen]

I'm modeling a dynamic block.
It represent a simple floor plan chimney.
The dynamic block has six stretch actions.
Three stretch actions are displayed in the properties menu.
Two strectch actions have grip points.
The total width and length.
Tree stretch actions are chaind.
They stretch with the wall thickness action.
Unfortunately they won't move equal. 

[bob_mpc · Accepted solution]

Should be OK now. I changed the chained actions (never understood how they work in full) with simple actions, modified by angle and multiplier

[YoshiCoolen]

Thank you, @bob_mpc .
You were very helpful.