I have finished half of the afghan. Right now it measures 14" x 42". If it isn't going to be wide enough at 28", I'll make a center - or side - row(s) to widen it. I might even add a few inches to the length. This being my first real knitting loom project, I'm basically testing but hopefully it will be pretty anyway. I love the lattice pattern that was naturally created by the variegated yarn as I knitted.
Have a nice day!