Scoot thanks as well as the rest of the board, I think I got it through my thick head. LOL

I think I finally got it I was thinking I need 24" inches "the draft" from the bottom of the cross beams to the bunks. But as I can see the arms for the bunks are not even 24" tall I will start with the 12 inches and go from there. and take in to consideration the cross beam height for the level of the water.

jmv