you really dont need that much seam allowance. in cloth sewing usually its 3/8 up to 1/2 in. leather wont unravel like cloth so you can sew a smaller seam allowance. one you have sewn seams you can glue down the seam to lay flat that is pull both sides down n glue. another trick i learned also is to take a mallet and pound down the seam before glueing that will help it lay flatter. as to neck to butt you need that way to get the length for the legs if you dont want seams across the front. good luck. Bronc/Bonnie