Alan,
Yes, you're right, the bunks are 8" and appear to be one piece of wood. I don't know the angle of the middle step of the 23' hull. Somebody help me out here. Here are a couple more images that should answer you questions.
I'll be pleased to pull the boat out into some daylight and take better images of this set-up, if you wish and I'll email a bunch of high-res.
I have to make one comment here. After crawling under the trailer to get these images, you really can appreciate the design and how awesome these hulls really are. I am so thankful...