The finished size of this piece is only 3 1/4 inches x 13 1/2 inches. The model is stitched on 35ct Sheep's Straw Linen over 2 threads. Sorry it is not big enough for what you want.

This pattern was stitched on 35c fabric with sheep straw linen. and the thread was silk from gentle art sampler or with 11 DMC floss colors and the count is 57w X 23h.

You're picking too narrow. Look for a wider rectangle.