I have an 18ft aluminum polar craft that used to be a duck boat. My plan is to turn it into a flounder gigging/shrimping/shallow fly fishing boat. I removed the small console and put on a Yamaha 40 hp tiller. Jred is making me a tiller extension, and I'm going to put a large cooler longways down the center. I was thinking about having the local aluminum shop bend me a grab bar to put at the end of the cooler. My question is how tall are your grab bars? Thanks for any input.