Daniel, great job on the checkering! Your horizontal rows of diamonds show some great craftsmanship. Very well done, because that is extremely hard to accomplish, and I'm very impressed that you have accomplished this on this first call that you have done.
One thing that will make it a bit easier on you, will be to not have your panels so wide. They are about as wide as they are long, which makes it harder to checker. Try a 4 panel instead of a 3 panel since you are limited on your length on this style of call, and see if that makes it a bit easier to checker.
Brian