@Sthiat. ::heh::Mia culpa.
I missed the "design" word ... I was thinking along the lines of "My only chopper is based on a Honda CB750", with the original CB750 being the core of the bike.
Mine's a CB750F (RC04) that I picked up in a junkyard. She was totaled in a wreck, barreling into Fixation Rock on Hwy35 (between Hwy9 and Page Mill Road) at about 95 miles per hour. The driver died instantly. Amazingly, the cases & block/heads were OK. In 1983, I rebuilt her as an old-school hard-tail, with a springer front-end. The chrome bits are chrome, the frame is black, the rest of the paint is BRG, the aluminum is electrolytically oxidized appropriately, and the rims are spokers, with modernish disk brakes (after an upgrade in 1997). All wires & plumbing are hidden in the frame, and she has no bodywork except the fuel tank and light fairings.
She's the most beautiful thing I've ever produced, other than my daughter. Her name is "Gracie", and is the only one of our bikes that my wife will ride pillion on. I've logged nearly 100,000 miles on her (with and without the Wife).The Wife has logged about 15,000 on her own.
 By several orders of magnitude ... If you have daughter(s), you grok ;-)