Hi this is my first post, but I have made two hammocks and two tarps in the past. I have some experience when it comes to making gear but I am looking to make a pair of quilts now and thought it wouldn't hurt to have some other opinions.
I am planing making a karo 30*-35* F UQ. I chose Karo step to avoid weighing out down. The desired finished dimensions are 70"x48"x1.75". I will have a 1" seam allowance. My baffle hight will be 1.5". the Differential top layer will be cut 74.5"x52.25" (not including seam allowance). I have attached a picture of my planned design. I am wondering if I am on the right track? With a quilt like this is the differential cut really worth it? Any feedback or thoughts would be appreciated.

Quilt layout.png