Hehe, I had to give it a go myself. So the parts would obviously have to be of the tracks in the current schedule. This is what I came up with. The parts aren't in their correct sizes, obviously...
So first it would start just like Sepang would start. The cars go through the 1-2-3 complex, getting a nice speed out of the third corner, which creates a challenge out of Maggots and Beckets. But instead of the Chapel corner, the drivers would instead get a little straight just before the S-curves of Suzuka. These are then combined to the very fast right sweeper of Korea, which leads the drivers to the longest straight of the track. After the straight comes the right handers, Ascari and Stewart, of Melbourne. Then the left Prost curve to the left. Then comes the combo-curve, as it is combined from the pieces of Melbourne and Istanbul. Then the demanding left hander of Istanbul. But instead of letting the drivers breath, they instead will have to still turn to the left a little, while going through the Montreal straight. Right after the little straight they get to L'Epingle, a tight hairpin. Finally they get to use the full throttle. They sweep Eau-Rouge while still getting some more speed, right until they get to the multicorner complex of Shangai. An off-camber curve, which should give a nice amount of challenge to the drivers. Then there is the arena complex from Hockenheim. To finish the track of with even more of a challenge, they will steam to the slowest corner of the track, the Grand Hotel Hairpin. Then they get to slam the throttle again and start the next demanding lap.
Weey, I made a tree!
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