The seatpost is a hard to come by these days lynskey 31.6 with enve clamp (the first 1bolt version).
The frame is built to take 38s+ fenders, they are are just currently not installed. The fork is an enve all road fork so it comes with the included enve fender which is obviously not installed either in the pic.
It rides great. Its the first bike in a lot of year that ive had designed around a flatbar setup. I really like it for our lunch rush that includes a lot of food deliveries. Carrying 10-20 lunches is a lot easier to handle when not on a dropbar bike..