Ok I have worked myself into a cross road. A buddy bought a boat a week ago and I went with him to get it instead of putting my floor in. It was a little smaller then mine, but it was set up almost how I wanted mine. There was an extension to the front deck, a floor, and pods. What caught my eye though was that there was a tunnel built in to it as well. After talking with the guy who owned it I found out it was all done in his sheet metal shop. He welded up the pods, deck, transom, and even the tunnel. After running it with my friend I soon couldn't help but notice it runs 5" shallower then mine. That made me jealous. I know if I cut one in I will lose speed, but if I run shallower then so be it. At least that is where I am now. Do I take the task of cutting in a tunnel? I know I can do it I am just concerned about size, and design. I don't want to put something in that is doing more harm then good, but if I could find some guidence in how to design it then I know I can get the river runner I want. That is where you guys come in. I was seeing if anyone has put a tunnel in or have pictures of thier tunnels in their boats they would be willing to share to help me make up my mind. Also if there are any other negative effects of a tunnel I should take into consideration as well. Here is a picture of the boat my buddy got. It doesn't show much but it was all we had of it.