Because the concept is minimal modification, not much changed from the stock. He change the tank, fenders, sidebody, and rear lamp. Also, he adds some parts like front shockbreaker cover, and rear footstep. Other still original.
Most of the custom parts are made from galvanized plate. Chassis to be cutted 22 cm. Saddle made thicker because it need to be comfortable. Last, he put custom fuel indicator from a small plastic bottle. Condition of fuel can be monitored from it whether it empty or has dirt in it.
For performance-wise, exhaust need to be made custom so it power increased significantly. And CDI BRT type bolt-on replace the stock CDI. Now he satisfied.
Nice one, Sir.