Been their done that aka late Fifties. The HD's had a Hinged Rear Fender, in front of the Tailight was Hinge, like a Piano Hinge. Fender was Flat, with actual dropped sides over the Tire, maybe two inches vertical. The Tires were Vintage Street Tread. Composite of the Tire center section was flat, not rounded. Solo Seat, big tank, no front fender, with the narrower but Vintage Front Tire. No Chrome, Regular Handle Bars. I saw, the pin pulled in the Fender, now we have a Vintage Bobber, minus Front Fender, Hill Climbing, and what was called Rabbit Runs were cross country, through Farms and Neighbors back yards. All organizedand with permission. No Hardtails, Street Bikes. Fenders were left off, rear had Tailight moved back up to fender above Hinge. Simpler to build today actually. Somebody build a square Hinged Fender on back. Squared off with the Hinge half left in place. VINTAGE!!!