I would second the Ergons and consider bar ends. I'd lose the rear rack in favor of a front bag if you need to carry stuff. The additional weight over the front wheel wheel actually helps handling. I'd also put some Stan's type liquid tubeless tire sealant in the tires since those tires are a little tricky to remove. If you are not familiar with SA 3 speeds make sure you are clear on how to adjust the cable tension for the hub before taking off for a ride. I like 2 way SPDs on my Brompton. Can't tell from the photo but the firm elastomer for the suspension is always something to consider especially if you are a heavier rider.