FWIW...I bought ebrabaek's suede renazco and I love it. It's proof that all butts aren't the same as it works great for me. Any other seat and I use an airhawk for any ride over 30 min. Only conundrum I see with the proposed design is the width up front would make it very tough to stand. Biggest issue I have with the renazco is when I stand up, it's wide for getting my feet on the pegs. I move forward to the narrow section and it's better. If you widen the whole seat, I would think it's harder yet.
Then again, maybe you just have them 'good birthin' hips'