The Velo seats aren't designed for the Rocket, so there is quite a lot of thinking required.
I sat in Velo pax seat for an half an hour contemplating how things were going to fit. I decided they wouldn't and I will need to make other plans. The seat is great, but it needs to sit forward of the flap bar to generate enough head room and I don't want to rebuild the flap mechanism below the floor level to make space. It was also a bit claustrophobic for the passenger.
Not to worry, I will sell the Velo pax seat as a really nice front seat for someone else's project and move on.