thanks guys
I plan on installing them in the middle of the vertical sides of the stern seats and off center for the forward bulkhead. There isn't any forward seats in my plans so I don't have to worry about messing them up. Dave, you forgot one attribute for the ports, STRONG. . if I find some I'll buy a couple for you too. Now I've started thinking about what might be good to store on the dingy. Which I suppose is a bad thing because they are called "flotation" chambers but I'm sure some stuff will accumulate over time. Well I better get back to building before I start filling it up.
thanks again
Len