I am making a down quilt as a covid lockdown project.
I am attracted to the flexibility of horizontal baffles, and the possibility of moving the down for different temperatures.
The “downside!” is the undesired shifting of the down during sleep to leave a cold spot.
I wonder if it would be helpful to sew a run of baffles perpendicular to the horizontal baffles, along a line approximately half way down the body position. Illustrated on a full taper quilt for simplicity.

The cross-baffles would not be attached to the shell, and only be approximately half the height of the main baffles.

This is my representation.
The cross baffles could be central – or alternatively closer to either inner or outer shells. Central would be easier for sewing the main baffles.
One end of each cross baffle could be attached to all the horizontal baffles first. They are then folded back while the horizontal baffle is attached to the first shell. Then the far end of the cross baffle could be attached prior to the next horizontal baffle being sewn on. The entire matrix will fold back with the outer shell as the baffles are progressively attached to the inner shell.
While lax, it should be easy enough to fill- even poking a tube of down past the first cross-baffle.
I am likely to chicken out and use the well-thought-out pattern based on experience from Aaron Sorensen.

I am interested in the thoughts of the experts here!!
In addition,a simple question .
How much “shrinkage” can one expect after filling with down – or really, how much extra length over the final desired length and width does the shell need to be cut?

