Need help from Karo Step quilt experts!

1/2 the standard i have seen is 12" box with 6" sides, however i have used 10" box with 6" sides and now use 14" box with 6" sides leaving a 4" gap on each side of the box or 8" between baffles. This same setup has been used on 2.25" and 3" loft quilts. I have no plans to use a different setup for 1.5" quilts.

3 This doesn't change from a standard baffled quilt. I do .25-.5" shorter than finished loft others do 80% i believe. On this quilt with only 1.5" loft i would use 3/4" high finished baffles to help control the small amount of down (less down always needs more control). You could also use the 12/6 or 10/6 spacing to give a little more control. I wouldn't go smaller than 10/6 or bigger than 16/6(Jerry W) for any quilt. 1.5" loft is border line candidate for sewn through which is why i would use 3/4"-1" finished baffle height to keep the down under control and still be warmer than sew through.

I am not the final word on this but i think you would do fine with any of the above.

-Tim

Thanks Tim,
The thiness of the quilt has me worried the most. Like you say, there is less room for error.