Dave Peros had one made, I think at Kent Fab. I'll check with him on where and how much and try to find you a pic. It was mounted on the forward casting platform and with a single tube protruding up from the deck, it had a tubular rack that would cradle you as you stepped into it. Very nice rig, he's a guide and was allways concerned for his clients in the chop. He has a Maritime Skiff, which has a bottom not unlike a Whaler and rolls some in the rips he likes to fish. Then again ALL BOATS roll in the rips!
I'll get back to you!