What thickness are you going with your knees? My guess is you're going to go with 1.5".
At least 1.5", I'm leaning toward 2" since I took the splaswell out. I'll take a picture of the mock up one I cut out. My plan is once the transom is installed I'll glass the knees from the transom back to the stringers as one piece instead of two like before. That was one reason why I cut the stringers so far back. I'll add a horizontal brace as well. Hope that makes sense.