I had a thought for you though: Mapams are not super expensive compared to Jardines, (6-700), and there is at least one one-off manufacturer making some for less as well (350-400). Both of those are 7" forward. I've tried the Jardines, and at 5'11"-33 inseam I could use them, but was super conscious about keeping my feet on them, and it was a noticeable distance to put my foot on the ground. Before you get Paul to start making a set, I'd suggest hunting some down and buying them. The biggest advantage you would get from going that route: you can try them for comparison, and figure out if you want yours in a slightly different position or not; you have a physical model to base your design off of; you will be able to easily sell them after your one-offs are done.