Originally Posted by Rogerogeroge

As others have said, the freehub isn't properly 'freewheeling'. Look at some YooTube vids and overhaul the freehub, it's not hard. If it's chain slapping, it's worth fixing.

Beautiful bike. I'm trying to deduct points for improper presentation, but everything appears to be in order. Valve steams vertically oriented, tire labels oriented to the valve stems, crank at 3:00 with chain in big chainring.....but I suspect your steerer needs to be cut 10 mm. Perhaps handlebars should be rotated up a smidge and the levers moved down that smidge.....and those crazy vertical slats make it harder to judge compared to a backdrop of a white garage door..... but nonetheless, a grand showing of a grand steed.