How to cover seams on a board & batten interior wall when calculations won't add up?
Rip down the 4 x 8 sheets into a width that will cover the length without a noticeable difference in batten spacing. 16 inch width works well with no waste on a sheet. While the finished look is a matter of preference, the smaller sections do have good look and disguise minor differences in panel sizes. MDF is my go to for the panels if you are painting the wall.